Minimon Worlds rules draft 2

Avoid using centre alignment for long paragraphs. Left alignment is much more comfortable to read.

English is not my native tongue so I'll help with what I can.

•I'm trying to simplify some sentences like:
"some Minimon enjoy the taste of death while others just fight to survive."

•There's a bit of a redundancy here:
"It is your job to choose a planet deck to represent. Battle other planet decks and exploit their weaknesses to emerge victorious."

•Card zones cards? I assume it's a typo:
"The battlefield is made up of card zones, which you are required to use during game play"

•Here the sentence starts talking about players and then you move to a second person. Since you're using the second person during the rest of the book it's better to have all the text in the same style.
"At the start of your turn you receive 1 resource token in the form of a star (coins is a good substitute)"

•I don't know if there's any rule in English about word repetition but to me it sound strange, I think it's better to use synonyms:
"The Defender monsters helps you protect your planet and monsters, without a defender monster on the battlefield, the opponent is free to attack your other monsters."

•Simplifying:
"The defender monsters comes with a shield Attribute. The number on it represents how many times you can defend. Once you use up all the shields your defender's health is exposed and you cannot defend with that monster. After that your opponent is free to attack other monsters or the defender monster until it is killed. Your opponent can attack your back row if you choose not to defend that turn."

I broke your sentences into shorter ones to make them clearer. Each concept a sentence.

"Some Defenders come with 2 types of effect abilities, one is the active ability which is activated when you choose to defend and use a shield. The other effect is passive and will automatically activate when you play the defender. It doesn’t require the use of a shield. The effect will remain active until the monster is removed from the battlefield."

"The attacker monsters are used to deal damage and strike at the opponent, without attacker monsters you cannot harm anything, including the opponent's planet."

"The supporter monsters are used to help your other monsters or make trouble for the opponent. The supporters will always have an effect (there's something missing here)"

"The supporter monsters' support attribute has a number on it that can be used to activate the monster effect on either players turn." (I'm not so sure about "either players turn" phrase, it sounds strange to me but I can't think of another wording)

"Unlike the attacker and defender monsters, you can freely remove the supporter monster from the battlefield on your turn and replace it with another supporter. If you place back down the same monster you removed, your support attribute is refreshed and you can use it again" (I didn't understand very well the rule, I assume this is what you meant)

"Attachments are used to increase the strength of your monsters. You are able to equip an attachment card to you monster on your turn by placing the card under the monster card like this"

"The world is your main card and remains at your side throughout the game. You can only have one world card by your side. Each world card has a different attribute that affects (I assume you meant affect) your monsters and sometimes game play. Each world offers a different game play style so no matter which world you choose, your experience will be different. You can only use monsters associated with the world you are using. Example, you cannot use Elendrall monsters with the Mazaric world."

"When you have a land card in your hand, on your turn place it on the extra zone. The land card can affect all of your monsters of the same type."

That's half of the rulebook, I'll take a look at the other half once I have a bit of time. Hope this helps.