Original: Since a United Nations-sponsored ceasefire agreement in 1991 , most of the territory ( including the entire Atlantic coast line ) has been controlled by Morocco , strongly backed by France , and the remainder by the SADR , strongly backed by Algeria .
Simplified: Since a United Nations-sponsored ceasefire agreement in 1991 , most of the territory has been controlled by Morocco , backed by France , and the rest by the Polisario\/SADR , backed by Algeria .