Complex sentence: Disney had already commissioned a report, internally presented in October 1989 before declaring the competition open between Long Beach and Anaheim, studying the economic impacts of new resorts as a strategic tool to build governmental support.
Split into simpler sentences: Disney had already commissioned a report before declaring the competition open between Long Beach and Anaheim. The report was presented internally in October 1989 and estimated the economic impacts of new resorts as a strategic tool to build governmental support.