Take another look at the original sentence:
You wanted to fix it this way:
To delete the comma between administration and he would cause an equally bad problem, a fused sentence. A fused sentence occurs when you have two main clauses joined with no punctuation whatsoever. Quang wants a degree in business administration is the first main clause. He fantasizes about yelling at future employees is the second main clause. The spot between administration and he needs a stronger break than blank space.
You might want to consult the rules for fixing comma splices and fused sentences.