In this task, given a sentence in the English language, your task is to convert it into the Japanese language.
Example: Test subjects will be administered either a placebo or PA-457 that will be taken in combination with the medication they already take.
Example solution: 被験者は、彼らがすでに服用している薬剤と一緒に偽薬またはPA-457を与えられる。
Example explanation: The above sentence is correctly translated from English to Japanese.

Problem: "But we knew that the health of the president had become a source of concern in recent days," he said.

Solution: 「しかし、私たちは大統領の健康は最近悩みの種になっていたことを知っていた」と彼は述べた。