Complex sentence: The 13th World Scout Jamboree was set to be held in Shizuoka Prefecture at Asagiri Kogen and, in preparation for the world event, the 5th Nippon Jamboree was held at this location in August 1970.
Split into simpler sentences: The 13th World Scout Jamboree was set to be held in Shizuoka Prefecture at Asagiri Kogen. In preparation for the world event 5th Nippon Jamboree was held at this location in August 1970.