Complex sentence: Emmett Grogan (c.1943--1978) was a founder of the Diggers in the Haight-Ashbury district of San Francisco, California who inspired Abbie Hoffman to undertake a similar venture on the Lower East Side of New York City during the mid- 1960s.
Split into simpler sentences: Emmett Grogan (c.1943--1978) was a founder of the Diggers in the Haight-Ashbury district of San Francisco, California. The Diggers ultimately inspired Abbie Hoffman to undertake a similar venture on the Lower East Side of New York City during the mid- 1960s.