Complex sentence: In the late 1940s, Renaldo starred in several Hollywood westerns as the Cisco Kid, and in 1950, he began playing the role in a popular television series that ran until 1956.
Split into simpler sentences: In the late 1940s he starred in several Hollywood westerns as the Cisco Kid. In 1950 Renaldo began playing the role in a popular television series that ran until 1956.