Complex sentence: Nonetheless, a significant number of the city's residents sympathized with, or were members of, the Viet Cong, and mortar attacks on U.S. and ARVN targets were frequently staged from residential districts in Bien Hoa.
Split into simpler sentences: Nonetheless, a significant number of the city's residents sympathized with, or were members of, the Viet Cong. Mortar attacks on U.S. and ARVN targets were frequently staged from residential districts in Bien Hoa.