Complex sentence: A spokesperson for Spence initially stated that she would attend the meeting, but Spence later clarified her position and rejected the invitation, as Governor General David Johnston had declined to attend, while Ontario Premier Dalton McGuinty was unavailable.
Split into simpler sentences: A spokesperson for Spence initially stated that she would attend the meeting, but later Spence clarified her position and rejected the invitation. In not attending, Spence stated that Governor General David Johnston had declined to attend while Ontario Premier Dalton McGuinty was unavailable.