Complex sentence: Popular legend holds that Rose was a member of Colonel James Bowie's forces and had fought during the siege of Bexar, and that he then joined Bowie in reinforcing the Alamo Mission in San Antonio de Bexar in late January 1836.
Split into simpler sentences: Popular legend holds that Rose was a member of Colonel James Bowie's forces and had fought during the siege of Bexar. He then joined Bowie in reinforcing the Alamo Mission in San Antonio de Bexar in late January 1836.