Complex sentence: He believed that all objects possessed this power, and desired to capture it in his painting and his own possession by painting them, this was inspired by a fascination he had with the atomic bomb, which he found particularly mystical and powerful.
Split into simpler sentences: He believed that all objects possessed this power, and desired to capture it in his painting and his own possession by painting them. This was inspired by a fascination he had with the atomic bomb, which he found particularly mystical and powerful.