How do I say “he loves his mother more than his wife”?
他比妻子更爱他的母亲  (he compare to his wife, he loves his mother more) means &quot;he loves his mother more than his wife does&quot; and it is not what the English sentence means.
他爱他的母亲胜过爱他的妻子 is correct but wordy, you can reduce it to 他爱(他的)母亲胜过爱(他的)妻子 --&gt; 他爱母亲胜过爱妻子

Replace 胜过 (better than) with 多过 (more than) --&gt; 他爱母亲多过爱妻子