Simplify the following text for a Grade 13 native English-speaking person.
Original: Transcendental Meditation ( TM ) refers to the Transcendental Meditation technique , a specific form of mantra meditation , and to the Transcendental Meditation movement , a spiritual movement . The TM technique and TM movement were introduced in India in the mid-1950s by Maharishi Mahesh Yogi ( 1914 â `` 2008 ) and had reached global proportions by the 1960s .
Simplified: The Transcendental Meditation technique , or TM technique , is a kind of meditation , that was developed by Maharishi Mahesh Yogi .