Complex sentence: Since spectators and other Olympic-related visitors would have to be accomidaged, more rooms would be needed, and as a result there were plans to arrange for their to temporarily be at least an additional 3,000 beds for visitors.
Split into simpler sentences: Since spectators and other Olympic-related visitors would have to be accomidated, more rooms would be needed. As a result there were plans to arrange for their to temporarily be at least an additional 3,000 beds for visitors.