Complex sentence: Kenner Toys ceased production of the 72000 series of Girder and Panel sets in 1979, ending the long run with their four "KENSTRUCT" sets, the Girder and Panel trademark seems to have been abandoned by the company.
Split into simpler sentences: Kenner Toys ceased production of the 72000 series of Girder and Panel sets in 1979, ending the long run with their four "KENSTRUCT" sets. The Girder and Panel trademark seems to have been abandoned by the company.