Complex sentence: For the movie, Jorge Negrete had requested that his girlfriend, the actress Gloria Marín be his costar; however, Félix was selected by the director, which led to a series of altercations between the couple.
Split into simpler sentences: For the movie, Jorge Negrete had asked his girlfriend, the actress Gloria Marín. But Félix was imposed by the director, which led to a series of altercations between the couple.