Complex sentence: They enter the church's office and encounter the terrified and smarmy deacon, they realize the church is far from empty as they believed, they accompany the deacon to a meeting planning to leave quickly so that his absence does not cause suspicion.
Split into simpler sentences: They enter the church's office and encounter the terrified and smarmy deacon. They accompany the deacon to a meeting, planning to leave quickly so that his absence does not cause suspicion.