The phrase "a position he maintained" is correct and usable in written English.
It can be used when discussing someone's stance or viewpoint on a particular issue that they consistently uphold over time.
Example: "Throughout the debate, he argued passionately for climate action, a position he maintained despite opposition from his peers."
Alternatives: "a stance he upheld" or "a viewpoint he defended".
He consistently argued against East Timorese self-determination, a position he maintained through 1999.
1930 Appointed Director of the University of California Museum of Paleontology, a position he maintained until 1949.
He decided scepticism and moderation were better than ideological extremes, a position he maintained throughout his life.
Tehran's nuclear program is peaceful, Eslamizad said, a position he maintained was supported by findings of the International Atomic Energy Agency, the U.N. nuclear watchdog.
Cambacérès was the second most powerful figure in France, and a devoted servant to Napoleon, a position he maintained, Mr. Woloch argues, out of a mixture of motives: money, a genuine sense that there was no alternative, prestige, even a love of good food and wine, of which his status gave him a steady supply.
Shortly after the sentencing, Mr. Coulson announced his resignation from The News of the World and later joined the Conservative Party, then in opposition, as Mr. Cameron's director of communications — a position he maintained after the party came to power as the dominant partner in a coalition government in 2010.
Stone became a co-host and frequent commentator on the site, a position he maintains to this day.
A few years later, in 1964, he was appointed full professor at the University of Stuttgart a position he maintained through 1991—and founded the Institute for Lightweight Structures and Conceptual Design at the university, a cutting-edge architectural research and development centre.
Mr. Acar sighed, slowly straightening up from a crouched position he maintains while drawing, and lighted another Parliament.
When Leno signed off on Feb. 6, he was still the top-rated host in late-night television, a position he'd maintained steadily since the mid-'90s (except during his ill-fated move to 10 p.m).
Still, Mr. Trump's brief remarks, tacked on to the end of a campaign appearance with military veterans at his new hotel in downtown Washington, represented a sharp reversal from a position he had publicly maintained, over howls of outrage from all but the far-right extreme of the political spectrum, since 2011.
