Complex sentence: Michelle Fowler and Sharon Watts take pity and allow her to stay with them, but after Donna tries to come between them she is thrown out and by September, she is living in an abandoned squat on the Square.
Split into simpler sentences: Michelle Fowler and Sharon Watts take pity and allow her to stay with them, but after Donna tries to come between them, they throw her out. By September she is living in an abandoned squat on the Square.