Complex sentence: Most of them are followers of Bowser, the so-called King of Koopa Troopas, and are Mario's enemies-these Koopa Troopas partake in Bowser's frequent attempts to invade the Mushroom Kingdom.
Split into simpler sentences: Most of them are followers of Bowser, the so-called King of Koopas, making them Mario's enemies. These Koopa Troopas partake in Bowser's frequent attempts to invade the Mushroom Kingdom.