Tā bǎ liǎng zhǒng fēnggé hùn zài yìqǐ, jiéguǒ zuòchéng le yí ge sìbúxiàng.
He mixed two styles together and ended up with something that is neither one nor the other.
Tips
memory
Literally 'like none of the four'. Folk tradition says this deer has a deer's antlers, a cow's hooves, a donkey's tail and a camel's neck, yet as a whole looks like none of them. Its standard name is 麋鹿.
usage
In the figurative sense it is disapproving: a design, plan or film that tries to be several things at once and ends up as none of them. It usually comes after a verb of becoming or after 是: 变成了四不像 'turned into an odd mix', 简直是一个四不像 'a real hodgepodge'.