Complex sentence: A young bird may see a warning patterned insect like a ladybird and try to eat it, but it will only do this once; very soon it will spit out the bitter insect; the other ladybirds in the area will remain unmolested.
Split into simpler sentences: A young bird may see a warning patterned insect like a ladybird and try to eat it. It will only do this once; very soon it will spit out the bitter insect; the other ladybirds in the area will remain unmolested.