Complex sentence: The Moche civilization began between the 1st and 7th centuries AD, occupying a territory that spanned much of what is now the northern coast of Peru, encompassing what is the coastal area of the departments of Ancash, Lambayeque and La Libertad today.
Split into simpler sentences: The Moche civilization began between the 1st and 7th centuries AD, occupying a territory that spanned much of what is now the northern coast of Peru. Encompassing what would become, the coastal area of the departments of Ancash, Lambayeque and La Libertad today.