Complex sentence: The bombardment began at 10 a.m. on 11 April and lasted for several hours, setting many buildings inside Hưng Hóa alight and inflicting heavy casualties on the Black Flag defenders.
Split into simpler sentences: The bombardment began at 10 a.m. on 11 April and lasted for several hours. It set many buildings inside Hung Hoa alight and inflicted heavy casualties on the Black Flag defenders.