Complex sentence: On the planned date of the match, Nacional and the City Council of Medellín organised a memorial to honor the victims of the tragedy, with about 45,000 people inside the stadium and thousand more in the streets.
Split into simpler sentences: On the planned date of the match, Nacional and the City Council of Medellín organised a memorial to honor the victims of the tragedy. About 45,000 people were present inside the stadium and thousand more in the streets.