Complex sentence: Whilst getting ready for a night in with Ste, Sinead discovers that her packet of condoms has been used and later, discover of Ste's affair with Harry and she leave Hollyoaks forever and taking Hannah with her.
Split into simpler sentences: Whilst getting ready for a night in with Ste, Sinead discovers that her packet of condoms has been used. Sinead will discover of Ste's affair with Harry and she will leave Hollyoaks forever, potentially taking Hannah (Ste and Sinead's daughter) with her.