Simplify the following text for a Grade 9 native English-speaking person.
Original: Mirza Ghulam Ahmad founded the movement on 23 March 1889 and termed it the Ahmadiyya Muslim Jama ` at ( community ) , envisioning it to be a revitalisation of Islam .
Simplified: Mirza Ghulam Ahmad founded the movement in 1889 and named it the Ahmadiyya Muslim Community .