Complex sentence: Kirby lives on a star shaped planet called Pop Star and must frequently save his world from various powerful antagonists, the most recurring one being King Dedede, an obese blue bird and self-proclaimed ruler of Dream Land (a region of Pop Star).
Split into simpler sentences: Kirby lives on a star shaped planet called Pop Star and must frequently save his world from various threats. The most frequent one being King Dedede, a gluttonous blue bird and self-proclaimed ruler of Dream Land (a region of Pop Star).