Complex sentence: McQueen considers the work incomplete until the stamps are released to the public, to that end a petition was created to gather support for the issuing of the stamps which by July 2010, had acquired 26,673 signatures.
Split into simpler sentences: McQueen considers the work incomplete until the stamps are released to the public. To that end a petition was created to gather support for the issuing of the stamps which by July 2010, had acquired 26,673 signatures.