Complex sentence: In the early 70's while teaching at Emerson College, he co-foundered the Charlestown Working Theater and serving as Artistic Director (5 years) created a number of original scripts with working class themes.
Split into simpler sentences: In the early 1970s, while teaching at Emerson College, he co-founded the Charlestown Working Theater. As its Artistic Director (5 years), he created a number of original scripts with working-class themes.