1、The small ship, Elkor, which had been searching the Barents sea for weeks, was on its way home.
小船“埃爾科”號在巴倫支海搜尋了幾個星期之后，正在返航途中。

2、The small ship, Elkor, which had been searching the Barents sea for weeks.
小船“埃爾科”號在巴倫支海搜尋了幾個星期之后。

3、Which had been searching the Barents sea for weeks, was on its way home.
在巴倫支海搜尋了幾個星期之后，正在返航途中。