Simplify the following text for a Grade 6 native English-speaking person.
Original: As the lakes in the Eastern Rift have no outlet to the sea and tend to be shallow , they have a high mineral content as the evaporation of water leaves the salts behind .
Simplified: The lakes in the Eastern Rift have no outlet to the sea and tend to be shallow . Therefore they have a high mineral content , as the evaporation of water leaves the salts behind .