The phrase "able to conquer a" is correct and usable in written English.
It can be used when discussing someone's capability or potential to overcome a challenge or achieve a goal.
Example: "With determination and hard work, she is able to conquer a variety of obstacles in her path."
Alternatives: "capable of overcoming a" or "able to defeat a".
It's clear that Rumple's "beastly" nature isn't going anywhere any time soon, which I'm glad about -- true love might be able to conquer all, but it would be a little too easy if Rumple just flipped a switch and was instantly reformed, especially since he's clearly playing the long con and has other plans besides simply releasing the wraith to kill Regina.
While he was able to conquer northern Syria and make it a province, in the south he could only weaken the strong state of Damascus and was unable, even after several wars, to eliminate it.
A dependence on drugs blighted much of her later life, but she was finally able to conquer her addiction with the help of a partner whom she called "my angel" but refused to identify.
At the turn of the 19th century, Napoleon was able to conquer most of Europe because he had a massive standing army from the peasantry, created by Lazare Carnot and the levee en masse.
If your anxiety is on the mild end of the spectrum -- perhaps you take the stairs because you're terrified of elevators -- you may be able to conquer your fear without the help of a professional.
The latter tribe, under Marbod, formed a quasi-state with a huge army and was able to conquer the Lugii tribal association among others.
As a consequence, Swinthila (621 631) was able to conquer the remaining Byzantine fortresses in the peninsula and to extend Visigothic authority throughout Spain.
As Harald had not been able to conquer Denmark despite his raids, he wanted to win a decisive victory over Sweyn.
" 'South Park' has yet to meet a platform it hasn't been able to conquer," Mr. Herzog said.
It was a kind of miracle – helped by inherited wealth – that the troubled Cézanne was able to conquer his demons by standing out in the southern sun, painting a mountain, or dwelling in suspended desire on the roundness of fruits in a bowl.
