The phrase "it was reported that" is correct and can be used in written English. You can use it when you are reporting something that someone else has stated or that news outlets have reported. For example: "It was reported that the President will be making a statement later today."
It was reported that you got £10m.
Recently, it was reported that smoking decreases RBC membrane fluidity.
It was reported that at least one journalist was attacked.
It was reported that many workers were in the building.
It was reported that by 1672, the plant was well established in New England.
It was reported that the gunman might be approaching.
It was reported that the man stabbed himself.
"It was reported that several people witnessed him jump".
It was reported that the court had split 10-5.
It was reported that a bypass flow of 20% was allowed in type A test.
Recently it was reported that argon plasma coagulation (APC) is effective for HRP.
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