Complex sentence: He suffered a hip injury in high school, and doctors told him he would never play football again, but Palmer graduated and enrolled at Texas Christian University in Fort Worth, Texas, where he played college football for the Horned Frogs.
Split into simpler sentences: He suffered a hip injury in high school, and doctors told him he would never play football again. Palmer, however, graduated and enrolled at Texas Christian University in Fort Worth, Texas, where he played college football for the Horned Frogs.