Complex sentence: In the early stages of the Triﬁnio Plan's development, the commission studied three international river basins, and in 1987 they developed a new plan involving the Lempa River Basin, the Ulúa River, and the Motagua River.
Split into simpler sentences: In the early stages of the Triﬁnio Plan's development the commission studied three international river basins. In 1987 they developed a new plan involving the Lempa River Basin, the Ulúa River, and the Motagua River.