Complex sentence: The rest of the patients did not believe in Rantés death, and they hoped he was only gone with his ship for some time, so they kept waiting for Rantés to return and take them away to his planet.
Split into simpler sentences: The rest of the patients did not believe in Rantés death, and they hoped he was only gone with his ship for some time. From then on they kept waiting for Rantés to return and take them away to his planet.