Complex sentence: While initially expecting about 200 people, approximately 3,000 people attended the event, brought about in part from the fact that not a single elected official from the area attended or endorsed the human rights event.
Split into simpler sentences: While initially expecting about 200 people, approximately 3,000 people attended the event. This was brought about in part from the fact that not a single elected official from the area attended or endorsed the human rights event.