The phrase "although he appreciates" is correct and usable in written English.
It can be used to introduce a contrast or exception in a sentence, typically indicating that despite appreciation, there is another point to consider.
Example: "Although he appreciates the effort put into the project, he believes there are significant improvements to be made."
Alternatives: "even though he values" or "despite his gratitude for".
Boullier is eager to challenge the top teams, although he appreciates next season will be another to grow and develop.
Amulo's husband is not happy with the Amref project, although he appreciates the safe water his family now gets from the borehole.
Although he appreciates the voter education campaigns conducted by actors and musicians working with MTV, Mr. Nowicki said he thought "students should be able to interact more with candidates instead of hearing about voting from musicians and movie stars".
According to friends of Boris: "Mr Johnson is thought to believe that the jokes hinder effective government and undermine his work, although he appreciates that he has spent a career making light of himself and others and was not complaining".
And beauty becomes something erotic not when it involves an attractive naked young woman lying on a bed (although he appreciates that), but when it attaches to deep feeling.
He has previously spent several short periods working abroad, and he would like to develop more collaborations with Western laboratories, although he appreciates that these depend on the continuing development of Hungarian science.
Father O'Hare said that although he appreciated the mayor's remarks, he believed that there had always been political pressures on the board.
SUSPENDED FOR 'TEBOWING' Two Long Island athletes have been suspended by school administrators for organizing several "kneel-downs" in tribute to Denver Broncos quarterback Tim Tebow, who said Friday that although he appreciated their boldness, the students had to obey their elders.
Mr. Rizzi was not in attendance, although he appreciated what the protesters were doing to promote a place with no name on its doors -- doors, by the way, that have yet to open.
Although he appreciated the admiration, he felt out of place and requested to return to the operating forces fighting the war.
Although he appreciated Eliot's work, Paul Goodman believed that the despair found within the poem meant that Eliot could not be a Christian poet.
