Complex sentence: During the off-fishing season he and his sons farmed pumpkins, sweet potatoes and paddy melons, but not successfully; whatever the bandicots and pigs didn't eat, the crocodiles did.
Split into simpler sentences: During the off-fishing season he and his sons farmed pumpkins, sweet potatoes and paddy melons, but not successfully. Whatever the bandicots and pigs didn't eat, the crocodiles did.