Complex sentence: While the city would rebel against the Almoravid garrison on more than one occasion, Sijilmassa became the Almoravid's first conquest and remained under their control until 1146, when the Almohad dynasty took control of the city.
Split into simpler sentences: While the city would rebel against the Almoravid garrison on more than one occasion, Sijilmassa became the Almoravid's first conquest. It remained under their control until 1146, when the Almohad dynasty took control of the city.