Complex sentence: May took part only reluctantly in order not to be ejected from the Abbey and separated from Raoul though she did spend some time on her own with Crowley and they sometimes went rock-climbing which was almost the only time they were on friendly terms.
Split into simpler sentences: May took part only reluctantly in order not to be ejected from the Abbey and separated from Raoul. They sometimes went rock-climbing, which was almost the only time they were on friendly terms.