Simplify the following text for a Grade 13 native English-speaking person.
Original: The enormous size of the depression made it fairly slow to develop , combined with some easterly wind shear in the eastern Atlantic and influence of the Saharan Air Layer to the north as it tracked south of the Cape Verde islands .
Simplified: The large size of the depression made it fairly slow to develop , combined with some easterly wind shear in the eastern Atlantic and influence of the Saharan Air Layer to the north as it moved south of the Cape Verde islands .