Complex sentence: Soon's funding is highly unusual at the Smithsonian in its association with fossil fuel interests, and included at least $230,000 from the Charles G. Koch Foundation which is associated with the oil industry and $469,560 from the Southern Company which uses coal to generate electricity.
Split into simpler sentences: Soon's funding is highly unusual at the Smithsonian in its association with fossil fuel interests. It included at least $230,000 from the Charles G. Koch Foundation which is associated with the oil industry and $469,560 from the Southern Company which uses coal to generate electricity.