Complex sentence: By February 15 the three remaining men had again run out of food and on February 18, were spotted and rescued by the British whaleship "Indian", 90 days after the sinking of the "Essex".
Split into simpler sentences: By February 15 the three remaining men had again run out of food. On February 18, were spotted and rescued by the British whaleship "Indian", 90 days after the sinking of the "Essex".