Complex sentence: According to the rumour it destroyed the pens and cages that housed the chickens and set them loose upon the island and waited in the jungle to capture and kill humans who ate his smaller brethern.
Split into simpler sentences: According to the rumour it destroyed the pens and cages that housed the chickens and set them loose upon the island. He lurks in the jungle waiting to capture and kill the humans who ate his smaller brethern.