Simplify the following text for a Grade 11 native English-speaking person.
Original: Over time , Frieza 's power became so great that his body could not comfortably contain it , and a series of physical transformations were developed that limit his actual strength While changing shape from his `` first-form '' , each alteration builds on the previous .
Simplified: Frieza 's power , including his enhanced strength , became so great over time that his body could not comfortably contain it , and a series of physical transformations were developed that limit his actual strength . While changing shape from his `` first-form '' , each alteration builds on the previous .