Complex sentence: The impact of the ball striking Chapman in the head was so loud that Mays, thinking it had hit Chapman's bat, caught the ball as it bounced onto the field and threw it to Pipp at first base.
Split into simpler sentences: The impact of the ball striking Chapman in the head was so loud that Mays thought it had hit Chapman's bat. Mays caught the ball as it bounced onto the field and threw it to Pipp at first base.