Complex sentence: In 2005, Berkeley sought to name the Berkeley main post office after Shirek, but the attempt was defeated in Congress due to her affiliation with the Niebyl-Proctor Marxist Library in Berkeley.
Split into simpler sentences: In 2005, Berkeley sought to name the Berkeley main post office after Shirek, but the attempt was defeated in Congress. This was because her affiliation with the Niebyl-Proctor Marxist Library in Berkeley.