Complex sentence: Alice Denney, 1922 -, curator and arts administrator, is the grande dame of the Washington, D.C. avant-garde and the mentor to a number of Washington's artists and arts administrators.
Split into simpler sentences: Alice Denney, 1922 -, is a curator and arts administrator. To some, she is considered to be the grande dame of the Washington, D.C. avant-garde and the mentor to a number of Washington's artists and arts administrators.