Complex sentence: He felt the excess airtime given to her came at the expense of him and other actors and was later replaced by one-time "All My Children" star Peter Bergman, who has played Jack ever since.
Split into simpler sentences: He felt the excess airtime given to her came at the expense of him and other actors. Lester was replaced by one-time "All My Children" star Peter Bergman, who has played Jack ever since.