Complex sentence: While Fred is distracted, Barney would eat some Pebbles but Fred would find out about Barney's lies and angry about his breakfast taken he would normally yell in anger, Barney !
Split into simpler sentences: While Fred is distracted, Barney would eat some Pebbles, but Fred would discover Barney's lies. Angry about his breakfast being stolen, he would normally yell in anger, Barney!