In this task, given a sentence in the English language, your task is to convert it into the Japanese language.
One example: Test subjects will be administered either a placebo or PA-457 that will be taken in combination with the medication they already take.
Solution is here: 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。
Explanation: The above sentence is correctly translated from English to Japanese.

Now, solve this: "For four-and-a-half years, he was an integral part of the team that worked to complete this vital link for our community."
Solution:
「4年半の間、彼は、私たちのコミュニティにとって極めて重要な連結部分を完成させることに取り組んだチームの不可欠な存在でした」