Complex sentence: The whole area was developed between 2003 and 2007 by the Bourne Stream partnership after the area became a problem: football pitches that were too boggy to be used, antisocial behavior from motorcycle riders, pollution from nearby commercial ventures and rubbish.
Split into simpler sentences: The whole area was developed between 2003 and 2007 by the Bourne stream partnership after the area was becoming a problem. Football pitches that were too boggy to be used, antisocial behavior from motorcycle riders and becoming polluted by nearby commercial ventures and rubbish.