Complex sentence: The Don Valley is home to some of Toronto's finest bike trail spanning dozens of miles both paved and dirt trails, which vary from relaxing to a more challenging ride, and if you know where to look you might even find a bike jump or two.
Split into simpler sentences: The Don Valley is home to some of Toronto's finest bike trails, spanning dozens of miles of both paved and dirt variety, which vary from relaxing to a more challenging ride. If you know where to look you might even find a bike a jump or two.