Complex sentence: One such theorist, Texas author Jim Marrs, wrote that most researchers were ready to accept Lovelady as the man in Altgens' photograph; he later wrote that others were resisting any such acceptance.
Split into simpler sentences: One such theorist, Texas author Jim Marrs, wrote that most researchers were ready to accept Lovelady as the man in Altgens' photograph. He later wrote that others were resisting any such acceptance.