Complex sentence: After passing near Boa Vista and moving away from São Vicente, Fred has been rapidly weakening back to a tropical storm on September 1 and further more a tropical depression on September 4.
Split into simpler sentences: After passing near Boa Vista and moving away from São Vicente, Fred has been rapidly weakening ever since. The storm has weakened back to a tropical storm on September 1 and further more to a tropical depression on September 4.