"rendering him" is correct and can be used in written English.
It means to cause someone to become a certain way, or to cause something to happen to them. For example, "The court's decision rendered him bankrupt".
Over the next 30 years, infection plagued Chamberlain's self-described "weak spot," rendering him bedridden.
Mr Morsi issued a snap decree rendering him and his constitution-writers immune from court oversight.
His father had a heart attack, rendering him unable to run the family business, Melart Jewelers.
Cloud gives a literally heart-stopping performance – stopping one volunteer's actual heartbeats, rendering him technically dead.
Compelling art doesn't hinge on grief, and fury can devastate a person, rendering him callous, remote.
In a rational world, this would be seen as rendering him ineffective.
It is the mental equivalent of his shoulder roll, rendering him untouchable.
When the male anglerfish reaches maturity his digestive system shuts down, rendering him unable to feed.
A crisp left-hook from Eubank Jr in the ninth bust the nose of Saunders, rendering him a bloody mess.
In mitigation, Anthony Orchard QC, defending, said Osolase suffers from glaucoma, rendering him 90% blind in one eye.
They apparently kicked and punched the sportsman, before rendering him unconscious by hitting him over the head with a stone.
