Complex sentence: The travellers spend a night here, but Timár can't sleep, and overhears a conversation in which Krisztyán blackmails Teréza, he tells her that if she doesn't give him money, he will reveal the existence of the island to the authorities.
Split into simpler sentences: The travellers spend a night here but Timár can't sleep and overhears a conversation in which Krisztyán blackmails Teréza. He tells her that if she doesn't give him money he will reveal the existence of the island to the authorities.