Complex sentence: When Omri arrives home from school, he is upset to discover that the Indian has returned to its original toy state but when he goes to bed, Omri once more hears the tapping noise he heard that morning.
Split into simpler sentences: When Omri arrives home from school, he is upset to discover that the Indian has returned to its original toy state. When he goes to bed, Omri once more hears the tapping noise he heard that morning.