Complex sentence: It also appears that he came into contact with the banned Christian sect known as the khlysty (flagellants) whose impassioned services, ending in physical exhaustion, led to rumors that religious and sexual ecstasy were combined in these rituals.
Split into simpler sentences: It also appears that he came into contact with the banned Christian sect known as the khlysty (flagellants). Their impassioned services, ending in physical exhaustion, led to rumors that religious and sexual ecstasy were combined in these rituals.