Complex sentence: Honduras consists mainly of mountains, with narrow plains along the coasts, a large undeveloped lowland jungle La Mosquitia region in the northeast, and the heavily populated lowland Sula valley in the northwest.
Split into simpler sentences: Honduras consists mainly of mountains, with narrow plains along the coasts. A large undeveloped lowland jungle, "La Mosquitia" lies in the northeast, and the heavily populated lowland Sula valley in the northwest.