Final answer:
Marcel Duchamp is the artist prominently known for assemblage artworks, despite Pablo Picasso's significant contributions to cubist constructions and collage.
Step-by-step explanation:
The artist known for their assemblage artworks and "Combine Paintings" is Marcel Duchamp. Assemblage involves creating new forms by using found, manufactured, or altered objects.
Though Pablo Picasso did revolutionize sculpture with cubist constructions and is a renowned modernist painter, it is Duchamp who is more closely associated with and known for the concept of assemblage through his Readymades.
Duchamp's influence paved the way for artists like Robert Rauschenberg and his Combines and contemporary artists like Jessica Stockholder. In the realm of cubism, George Braque is also noteworthy for his works that fracture and reconstruct objects, while Picasso's collage works came shortly after Braque introduced the technique.