Complex sentence: The boat is propelled by the oiler and the correspondent who row in shifts, attempting to move the boat towards what they think to be a lighthouse or a life preserving station, which is barely visible, but enough to provide a spark of hope.
Split into simpler sentences: The boat is propelled by the oiler and the correspondent, who row in shifts, attempting to move the boat towards what they think to be a lighthouse or a life preserving station. Their goal is barely visible, but enough to provide a spark of hope.