Complex sentence: He introduced a young Dolly Parton to the audience of his long-running television show, and they were a well-known duet team throughout the late 1960s and early 1970s.
Split into simpler sentences: He introduced a young Dolly Parton to the audience of his long-running television show. Together, "Porter and Dolly" were a well-known duet team throughout the late 1960s and early 1970s.