Complex sentence: The Infants School was amalgamated with the Petrie Terrace School in Moreton Street from July 1960, at which time the Hale Street school became the Petrie Terrace Opportunity School (for children with disabilities).
Split into simpler sentences: The Infants School was amalgamated with the Petrie Terrace School in Moreton Street from July 1960. Following the removal of the infants school to Moreton Steet, the Hale Street school became the Petrie Terrace Opportunity School (for children with disabilities).