Complex sentence: He starred in several television series spanning a career of more than five decades which included such popular roles as Bret Maverick in the 1950s western-comedy series, "Maverick", and Jim Rockford in the 1970s detective drama, "The Rockford Files".
Split into simpler sentences: He starred in several television series spanning a career of more than five decades. These included his popular roles as Bret Maverick in the 1950s western-comedy series "Maverick", and Jim Rockford in the 1970s detective drama "The Rockford Files".