Complex sentence: Irwin Allen Ginsberg (June 3,1926--April 5,1997) was an American poet, and one of the leading figures of both the Beat Generation during the 1950s and the counterculture that soon followed.
Split into simpler sentences: Irwin Allen Ginsberg (June 3,1926--April 5,1997) was an American poet. He is considered to be one of the leading figures of both the Beat Generation during the 1950s and the counterculture that soon followed.