Complex sentence: The two Dubai concerts held special importance for two reasons, including that it was the tour finale and Googoosh was roumered to be planning to return to Iran, therefore, many people believed it might be their last chance to see her.
Split into simpler sentences: The two Dubai concerts held special importance f. It was the tour finale, and Googoosh was rumored to be planning to return to Iran. Therefore many people believed it might be their last chance to see her.