Complex sentence: Sachal Sarmast was an ardent follower of Wahdat-ul-Wujood ("unity of existence"), an Islamic Philosophy synonymous with Hamah Oost (all from One), and Advaita Vedanta philosophy.
Split into simpler sentences: Sachal Sarmast was an ardent follower of Wahdat-ul-Wujood, an Islamic Philosophy synonymous with Hamah Oost. The concept of Hamah Oost (all from One) is similar to that found in Advaita Vedanta philosophy.