Complex sentence: Uranium prices reached an all-time low in 2001, costing US $7/lb, but but in April 2007 the price of Uranium on the spot market rose to US $113.00/lb, a high point of the uranium bubble of 2007.
Split into simpler sentences: Uranium prices reached an all-time low in 2001, costing US $7/lb, but has since rebounded strongly. In April 2007 the price of Uranium on the spot market rose to US $113.00/lb, a high point of the uranium bubble of 2007.