Complex sentence: Marbleworks (R) is a children's toy released in 1982 by Discovery Toys that consists of colorful, sloped, plastic half-pipes of different designs, which interlock, creating a track on which which marbles are run.
Split into simpler sentences: Marbleworks (R) is a children's toy released in the early 1980's by Discovery Toys that consists of colorful, sloped, plastic half-pipes of different designs. The individual pieces interlock, creating a track on which which marbles are run.