Complex sentence: The BNHS's ever increasing collection of live animals gave Phipson the idea of establishing a Society-managed zoological gardens in Bombay; this effort, however, failed, as the Bombay Municipality did not agree to the site selected by Phipson for the proposed zoo.
Split into simpler sentences: The BNHS's ever increasing collection of live animals gave Phipson the idea of establishing a Society-managed zoological gardens in Bombay. However, this effort failed as the Bombay Municipality did not agree to the site selected by Phipson for the proposed zoo.