"constrained him from" is correct and usable in written English.
You can use this phrase when you want to describe something limiting someone from doing something. For example, "The tight budget constrained him from taking the vacation he wanted."
The Constitution constrained him from candor.
Asked if the legal doubts of the attorney general constrained him from making a commitment to the US, Blair said "No".
In a phone call, Dr. Owens said that he did not know Mr. Knoop and that patient confidentiality constrained him from speaking.
The British government's report on Iraq's weapons of mass destruction makes an explicit and extensive case that Saddam Hussein has been working to break through barriers that have constrained him from rebuilding his military and the deadly weaponry that he possessed a decade ago.
Asked if Lord Goldsmith's legal doubts constrained him from making a commitment to the US, Mr Blair said "No".
Although he will have a Republican-controlled Congress to smooth his policy path, constitutional and other checks are likely to constrain him from impulsive adventurism.
We don't like what he's saying because it offends our intuitions about what is fair and what is just, so we try to physically constrain him from doing so.
His answer to ABC's George Stephanopoulos -– "We keep our options quiet" -– indicated that the objection to Obama's comments about Pakistan was not something that would constrain him from acting, but rather a choice of how to conduct diplomacy.
The walker may avoid traveling through some areas in the environment, even if there are no explicit physical obstacles due to non-physical parameters (e.g., gender, age, personality, lifestyle, culture or social norms) imposed that constrain him from locomotion.
Reinhardt didn't let the constraints on his court in the Magana Ortiz case constrain him from penning a sharp rebuke of the president and his government.
"People are constrained from smoking, from unsafe sex, from failing to buckle seat belts," Dr. Koshland wrote.
