Grant Grand was a superstar high school athlete from a small town where football was revered. The people of this town placed suc
h a high value on victories that a top performer like Grant was given privileges and exceptions that all others were denied. Grant did not have to struggle his way through rigorous courses in high school. Instead he attended special study sessions with members of the athletic department where the participants studied little other than football. To the surprise of few, Grant was given a full ride to a reputable university based on his athletic prowess, but Grant was not prepared for this new experience. He expected the university to make numerous special exceptions for him as his high school had, and while he did receive quite a few of these exceptions, it was not enough to compensate for how woefully underprepared he was. Despite numerous good faith interventions by the university, Grant failed to get it together, lost his scholarship, and dropped out after his freshman year.
A non-restrictive modifier add information that does not restrict who the subject can refer to (compare to "The one Marlena that enjoys many subjects" -this one restricts the subject to a specific Marlena). Here it's "who enjoys many different subjects" - it adds additional information about her, but doesn't change the referent.