Complex sentence: Teri discovers that much of the town's land legally belongs to Susie's grandfather, and it becomes a fierce race to the finish as Zach locates the requisite title deed and draws the attention of the police; meanwhile Roger is warned and makes his own plans.
Split into simpler sentences: Teri discovers that much of the town's land legally belongs to Susie's grandfather, and it becomes a fierce race to the finish as Zach locates the requisite title deed. It draws the attention of the police; meanwhile Roger is warned and makes his own plans.