Complex sentence: They agree that, as they will all end up being successful they will all look after Alistair and make sure they'see him right', this agreed they open the door to the distraught Rachel and allow her to call an ambulance.
Split into simpler sentences: They agree that, as they will all end up being successful, they will all look after Alistair and make sure they'see him right'. This agreed they open the door to the distraught Rachel and allow her to call an ambulance.