Complex sentence: Permanent concrete stands, separated by entryways from the east and west grandstands, were put in place of the temporary bleachers, the playing field was lowered eight feet and the track was removed.
Split into simpler sentences: Permanent concrete stands, separated by entryways from the east and west grandstands, were put in place of the temporary bleachers. Also the playing field was lowered eight feet and the track was removed.