Complex sentence: But her biggest break was starring on two Now and Forever seasons, Tinig and Ganti, which gained high ratings despite its afternoon timeslot; and through Bakekang, which her villainous character became a household name.
Split into simpler sentences: But her biggest break was starring on two seasons of "Now and Forever", "Tinig" and "Ganti", which garnered high ratings. She appeared on "Bakekang", in which her villainous character became a household name.