Complex sentence: Gahagan Douglas entered politics in the late 1930s but would remain a touchstone for decades after, being mentioned in the 1965 song "George Murphy" by satirist Tom Lehrer.
Split into simpler sentences: Gahagan Douglas entered politics in the late 1930s but would remain a touchstone for decades later. She was mentioned in the 1965 song "George Murphy" by satirist Tom Lehrer.