Complex sentence: Since Xiao Shu was on her phone she was not aware Zhou Zhen had gotten off at his stop she ask the taxi driver to turn back to his stop because she wanted to pay him back for paying for her fare also.
Split into simpler sentences: Since Xiao Shu was on her phone she hadn't notice Zhou Zhen had gotten off at his stop. She ask the driver to turn back to his stop because she wanted to pay him back for paying for her fare also.