Complex sentence: During the 1950s and 1960s, Mexico was full of crossover movie stars including Antonio Aguilar, making western films, usually singing in them like a Latin version of Elvis, the scripts groomed to fit his more high-profile career.
Split into simpler sentences: During the 1950s and 1960s, Mexico was full of crossover movie stars. You had the singer, Antonio Aguilar, making western films, usually singing in them like a Latin version of Elvis, the scripts groomed to fit his more high-profile career.