Complex sentence: We see one of Iruka playing soccer but they don't invite Mizuki and Mizuki wonders behind the bush why everyone cares for Iruka so much while he is left alone and scratches the tree which causes the Hokage to find him there.
Split into simpler sentences: We see one of Iruka playing soccer but they don't invite Mizuki and Mizuki wonders behind the bush why everyone cares for Iruka so much while he is left alone. He scratches the tree which causes the Hokage to find him there.