Complex sentence: Reagon was an active participant in the Civil Rights Movement of the 1960s as a member of The Freedom Singers, organized by the Student Non-violent Coordinating Committee (SNCC) for which she was also a field secretary.
Split into simpler sentences: Reagon was an active participant in the Civil Rights Movement of the 1960s. She was a member of The Freedom Singers, organized by the Student Non-violent Coordinating Committee (SNCC) for which she was also a field secretary.