Complex sentence: The NSWCA were outraged by Lord Harris's letter and convened a special meeting to consider their response and subsequently had their honorary secretary, Mr J.M. Gibson, write to "The Daily Telegraph" in reply.
Split into simpler sentences: The NSWCA were outraged by Lord Harris's letter and convened a special meeting to consider the letter. They had their honorary secretary, Mr J.M. Gibson, write to "The Daily Telegraph" in reply.