Complex sentence: The thankga is not a flat creation like an oil painting or acrylic painting but consists of a picture panel which is painted or embroidered, over which a textile is mounted, and then over which is laid a cover, usually silk.
Split into simpler sentences: The thankga is not a flat creation like an oil painting or acrylic painting. Rather, it consists of a picture panel which is painted or embroidered, over which a textile is mounted, and then over which is laid a cover, usually silk.