Complex sentence: When she gets into the house party, she finds her ex-boyfriend in the middle of the dancefloor; she tries to reach him to give him the DVD that she recorded in front of the camera but he walks away without noticing her.
Split into simpler sentences: When she gets into the house party, she finds her ex-boyfriend in the middle of the dancefloor. She tries to reach him to give him the DVD that she recorded in front of the camera but he walks away without noticing her.