Simplify the following text for a Grade 10 native English-speaking person.
Original: Monson was ordained an apostle at age 36 and served as President of the Quorum of the Twelve Apostles from March 12 , 1995 until he became President of the Church .
Simplified: Monson was made an apostle at age 36 and served as a member of the Quorum of the Twelve Apostles until he became the President of the Church .