Complex sentence: At the reception, River leaves her blank diary for Amy, which prompts Amy to recall the Doctor and something he told her when she was seven; she interrupts her father's speech, imploring the Doctor to come back.
Split into simpler sentences: At the reception, River leaves her blank diary for Amy which prompts Amy to recall the Doctor and something he told her when she was seven. She interrupts her father's speech, imploring the Doctor to come back.