Complex sentence: Ada Leonard (July 22,1915--November 29,1997) was the leader of the All-American Girl Orchestra, the first all-girl group to tour with the USO during World War II. McGee, K. A. (2009).
Split into simpler sentences: Ada Leonard (July 22,1915--November 29,1997) was an American bandleader. She was the leader of the All-American Girl Orchestra, the first all-girl group to tour with the USO during World War II. McGee, K. A. (2009).