Complex sentence: With the new lift, Timberline added the Still Creek Basin to skiable terrain on the lower mountain which almost doubles the area below the timberline, which provides much needed capacity on days with wind or limited visibility when the Magic Mile and Palmer do not open.
Split into simpler sentences: With the new lift, Timberline added the Still Creek Basin to ski-able terrain on the lower mountain. Jeff Flood and the Still Creek Basin almost doubled the ski-able area below the timberline, which provides much needed capacity on days with wind or limited visibility when the Magic Mile and Palmer cannot open.