Review the original item:
Alphonso does not care as much about comfort as he does about
style he will wear, for example, a long sleeve
shirt and a leather jacket in the middle of a Florida summer if they are
the perfect complement to his new pair of khakis.
You wanted to fix it this way:
Alphonso does not care as much about comfort as he does about
style,
but he will wear, for example, a long sleeve shirt and a leather
jacket in the middle of a Florida summer if they are the perfect complement
to his new pair of khakis.
Connecting two complete sentences with a comma and a coordinating conjunction like but is perfectly legal in writing. However, when you use this option, you must be certain that the coordinating conjunction you have chosen logically joins the two sentences.
But shows contrast; the sentence above, though, does not need a contrast transition.
You might want to consult the rules for fixing comma splices and fused sentences.