Complex sentence: However, after seeing and hearing that everyone interrogated has been killed, Frederic escapes by jumping into a river and soon heads to Milan to find Catherine only to discover that she was sent to Stresa.
Split into simpler sentences: However, after seeing and hearing that everyone interrogated has been killed, Frederic escapes by jumping into a river. He heads to Milan to find Catherine only to discover that she had been sent to Stresa.