Court found there was a material change in circumstances (respondent received income from pension division; applicant retired with reduced income and assumed sole responsibility for the child), applied Divorce Act principles and relevant authorities (Boston, Moge, Bracklow), balanced the objectives of spousal support and concluded maintenance should be reduced to $300/month effective September 1, 2005 and be time‑limited to end August 31, 2008 (duration equal to length of marriage).