The board resolved to divest its overseas holdings.

Literal

Board [topic-は] overseas [possessive-の] shares [object-を] abandon [nominalizer-こと] [object-を] resolved.

持ち株を放棄する (to abandon/divest shares) and 議決する (to resolve/vote) are formal business vocabulary. ことを議決する nominalizes the action and makes it the object of the board's resolution.