Complex sentence: He received his M.D. from Cleveland Medical College (now Case Western Reserve University School of Medicine), studied surgery at the University of Pennsylvania in 1863 and served as a battlefront surgeon for the Union Army in the Civil War.
Split into simpler sentences: He received his M.D. from Cleveland Medical College (now Case Western Reserve University School of Medicine) and studied surgery at the University of Pennsylvania in 1863. He then served as a battlefront surgeon for the Union Army in the Civil War.