"In spring practice Boren impressed his coaches and teammates,[67][68] however he refused all interview requests." Shouldn't that be "During spring practice"? Replace the comma with a semi colon and add a comma after "however" instead.
Is the subheading "College" really mean "Career"? I'm guessing that playing collage football is not a career, but a past-time, am I right? Please forgive my lack of knowledge about American football, since I live in Melbourne, Australia.