The phrase "although it is thought" is correct and usable in written English.
It can be used to introduce a contrast or a concession regarding a belief or opinion that is commonly held.
Example: "Although it is thought that the project will take a year to complete, we believe it can be finished in six months."
Alternatives: "even though it is believed" or "despite the common belief".
The use of aldrin in Mexico is forbidden because of its high risk to human health, although it is thought that some illegal use occurs due to its low cost.
Although promising, 2-methoxyoestradiol is not a specific HIF-targeting compound and its mechanism of action is not clear, although it is thought to be related to disruption of microtubule assembly in the cell [ 23].
It in fact sold for £205,000, although it is thought by experts to be a Titian and its true market value several million pounds.
No comment has yet been offered by those charged, although it is thought that they will deny the allegations.
The cause of his condition is not fully understood, although it is thought to be passed on genetically.
The exact age of Aleppo is unknown, although it is thought to be among the world's oldest continuously inhabited cities.
The etiology of obsessive compulsive disorder (OCD) remains unknown, although it is thought to involve an interaction of genetic and environmental factors.
The exact scale of the JP Morgan moves has not yet been finalised, although it is thought that between 500 and 1,000 could be relocated.
Those ruined walls are generally dated to the 6th century bce, although it is thought that the area was occupied for several centuries prior to that.
Although it is thought unlikely to suffer in any Assembly elections it would prefer to avert them, since republicans are seeking a more smoothly functioning administration.
His Holiness is currently in Jaipur for a literary festival although it is thought he may return to attend the 50-over game this weekend.
