Simplify the following text for a Grade 9 native English-speaking person.
Original: Canadian author and journalist Paul Grescoe reported in 1968 that `` A British magazine said his teacher was Jagad Guru Shankaracharya Swami Brahmananda Saraswati , ... or Guru Dev for short .
Simplified: In time , he became a disciple of Swami Brahmananda Saraswati , who was called `` Guru Dev '' .