Complex sentence: After a month of heavy but inconclusive fighting, Lucas was relieved and sent home, replaced by Major General Lucian K. Truscott, previously the commander of the U.S.3rd Division.
Split into simpler sentences: After a month of heavy but inconclusive fighting, Lucas was relieved and sent home. His replacement was Major General Lucian K. Truscott, the previous commander of the U.S.3rd Division.