Complex sentence: In his later years, Horace Dobbins became more involved with other activities and non-profit organizations, such as the Pasadena Country Club and the Cumberland Club (which is in Portland, Maine).
Split into simpler sentences: In his later years, Horace Dobbins became more involved with even more activity and non-profit organizations. A few to name is the Pasadena Country Club and the Cumberland Club (which is in Portland, Maine).