Complex sentence: Henry Armstrong Reed (April 27,1858--June 25,1876) was the nephew of George Armstrong Custer and was killed with his 3 uncles at the Battle of the Little Bighorn.
Split into simpler sentences: Henry Armstrong Reed (April 27,1858--June 25,1876) was the nephew of George Armstrong Custer. He was killed with several of his uncles at the Battle of the Little Bighorn.