Complex sentence: The boat, without a mast and a rudder, was carried across the northern Pacific Ocean by currents, and drifted for 14 months, during which the crew lived on water (they knew how to desalinate seawater) and on the rice of their cargo.
Split into simpler sentences: The boat, without a mast or a rudder, was carried across the northern Pacific Ocean by currents. It drifted for 14 months, during which the crew lived on desalinated seawater and on the rice of their cargo.