Complex sentence: The show ran for ten seasons from 1953 to 1962 and, as a result it increased Reagan's profile in American households, especially as he had appeared in feature films mostly in supporting role or as a "second lead".
Split into simpler sentences: The show ran for 10 seasons from 1953 to 1962, which increased Reagan's profile in American households. Previously, he had appeared in feature films mostly in supporting role or as a "second lead".