Simplify the following text for a Grade 10 native English-speaking person.
Original: The cast features fifteen major roles with star billing : eleven return from the fifth season , , one returns from the fourth season after a year 's absence , and three are new regular cast members .
Simplified: The cast features 15 major roles with star billing : 11 return from the fifth season , one returns from the fourth season after a year 's absence , and three are new regular cast members .