Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1146 , the Almohad ruler Abd al-Mu ` min turned Rabat 's ribat into a full scale fortress to use as a launching point for attacks on Spain .
Simplified: In 1146 , the Almohad ruler Abd al-Mu ` min turned Rabat 's ribat into a full scale fortress . It was used as a starting point for attacks on Spain .