Complex sentence: Paintings such as "The Medium" (1951) and his "Séance" series of the mid- 50s depict mediums channeling spirits; he considered the artist a kind of channel, one whose reward was "pleasure, ecstasy from contact with the unknown".
Split into simpler sentences: Paintings such as "The Medium" (1951) and his "Séance" series of the mid- 50s depict mediums channeling spirits. He considered the artist a kind of channel, one whose reward was "pleasure, ecstasy from contact with the unknown".