Complex sentence: The park was hampered by two driving forces, first in the summer the stadium was home to a lage population of files that pestered fans, and second, there was only one road leading to and from the stadium, creating a traffic nightmare.
Split into simpler sentences: The park was hampered by two driving forces: first, in the summer the stadium was home to a lage population of files that pestered fans. Second, there was only one road leading to and from the stadium, thus creating a traffic nightmare.