Complex sentence: In early June 2011, Graeme and Xin become increasingly attracted to each other and finally after a heated argument, they sleep together and Xin asks Graeme to decide who he wants to be with, her or Tina.
Split into simpler sentences: In early June 2011, Graeme and Xin become increasingly attracted to each other and finally after a heated argument, they give in to their feelings and sleep together. Xin tells Graeme to choose who he wants to be with, her or Tina.