Complex sentence: She moved to the U.S. in 1916 and made her Broadway début in New York City; and, until the beginning of the 1930s, she divided her time between New York City and London.
Split into simpler sentences: She moved to the U.S. in 1916 and made her Broadway début in New York City. Until the beginning of the 1930s, she divided her time between New York City and London.