Complex sentence: She became the first female principal in the city of Rochester school district in New York and was involved in many organizations such as: the New York Women's Suffrage Association, the Red Cross, and the Christian Temperance League.
Split into simpler sentences: She became the first female principal in the Rochester school district in New York. She was involved in many organizations such as: the New York Women's Suffrage Association, the Red Cross, and the Christian Temperance League.