Complex sentence: The Guindy School was a school that was temporarily based in Madras and had been started by Besant in 1918, was a well recognized school and its first headmaster, G.V. Subba Rao (GVS) was a young and renown theosophist.
Split into simpler sentences: The Guindy School was a school started by Besant in 1918 and was temporarily based in Madras. It was a well recognized school and its first headmaster, G.V. Subba Rao (GVS) was a young and renown theosophist.