Complex sentence: A popular story holds that Wayne had been offered the part of Matt Dillon and had turned it down, but this was refuted by Charles Marquis Warren, who produced the first year of the television version of "Gunsmoke" and made the major casting decisions.
Split into simpler sentences: A popular story holds that Wayne had been offered the part and had turned it down. However, this was refuted by Charles Marquis Warren, who produced the first year of the television version of "Gunsmoke" and made the major casting decisions.