Review the original item:
Quang wants a degree in business administration,
he fantasizes about yelling at future subordinates who are too afraid
of losing their jobs to defend themselves.
You wanted to fix it this way:
Quang wants a degree in business administration he
fantasizes about yelling at future subordinates who are too afraid of losing
their jobs to defend themselves.
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 subordinates 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.