Complex sentence: Both the Santamarias and Chico drive off fearfully, leaving Babi behind with no choice but to get home with H. He rides her home, but they are seen by Babi's mother, who disapproves of H and his motorcycle.
Split into simpler sentences: Both the Santamarias and Chico drive off fearfully, leaving Babi behind. H rides her home, but they are seen by Babi's mother, who disapproves of H and his motorcycle.