Complex sentence: Stacey advises Bex to tell Shakil how she feels and when the pair are alone in Bex's room, Bex stops Shakil from going further than kissing and he calls her frigid.
Split into simpler sentences: Stacey advises Bex to tell Shakil how she feels. When the pair are alone in Bex's room, she stops him from going further than kissing, so he calls her frigid.