The phrase "although he contended" is correct and usable in written English.
It can be used to introduce a contrasting idea or to present a counterargument in a discussion or narrative.
Example: "Although he contended that the project would succeed, many were skeptical of its feasibility."
Alternatives: "even though he argued" or "despite his claims".
Nicklaus never won another regular tour event, although he contended at the 1998 Masters at 58, finishing tied for sixth.
Although he contended that the injections were rejuvenating, subsequent researchers came to believe that the placebo effect was at work.
He admitted that the Knicks did not look good, although he contended that injuries, not poor decisions, were to blame.
"I don't think anyone will sign him simply because he is gay," Buzinski said, although he contends that Collins could present a great marketing opportunity.
He also concedes that the equal protection basis for the Supreme Court ruling was faulty (although he contends a better one was available).
Although he contends that greater consolidation will be harmful, he said that he understands why people might ask whether "we may have lost all the diversity" on the airwaves already.
Officials are now trying to force Mr. Ai to pay a substantial amount of money that they say he owes in back taxes, although he contends that that accusation is a cover for trying to rein in his scathing political commentaries on the Communist Party.
Study author Kim is also cautious, although he contends the finding is a valuable clue to the role of the transporter gene in ADHD and other disorders.
The constant communication back and forth will have a cumulative effect, he contends, although it may take a decade to bear fruit.
But he contends that although he prospered, his relations with Mr. Hussein were never good, souring years before he was expelled over what he said was his criticism.
He contends that although the Turkish and Iranian Muslim reformers have undergone a process of moderation and been considered as the leading examples of Muslim democrats in the Islamic world, they did not cause a wholesale democratization.
