Complex sentence: On April 6, a detail of men digging Boyle's grave observed figure approaching from seaward, a Lieutenant Bedford Pim of H.M.S. "Resolute", which was wintering off Melville Island under Captain Henry Kellett 28 days away by sledge.
Split into simpler sentences: On April 6, a detail of men digging Boyle's grave observed a figure approaching from seaward. It was Lieutenant Bedford Pim of H.M.S. "Resolute", which was wintering off Melville Island under Captain Henry Kellett 28 days away by sledge.