Complex sentence: He coined the term superflat, which describes both the aesthetic characteristics of the Japanese artistic tradition and the nature of post-war Japanese culture and society, and is also used for Murakami's own artistic style and that of other Japanese artists he has influenced.
Split into simpler sentences: He coined the term superflat, which describes both the aesthetic characteristics of the Japanese artistic tradition and the nature of post-war Japanese culture and society. Superflat is also used as a moniker to describe Murakami's own artistic style and that of other Japanese artists he has influenced.