Complex sentence: Shri Manilal Karamchand Sanghavi was a founding member of the Bombay Stock Exchange, from its days under the banyan tree in Horniman Circle to Dalal Street and was a Stock Exchange Cardholder, a position that was highly coveted and tradable.
Split into simpler sentences: Shri Manilal Karamchand Sanghavi was a founding member of the Bombay Stock Exchange. He was a key proponent of a stock traders organization and was involved from its days under the banyan tree in Horniman Circle to the first official offices at Dalal Street and was a Stock Exchange Cardholder, a position that was highly coveted and tradable.