Complex sentence: In March of that year, Nike released the Nike Dunk SB collection, due to the increased popularity of skateboarding in California, and the associated shoe designs differed from the previous SB Dunk range in that they were designed specifically for skateboarding.
Split into simpler sentences: In March of that year, Nike released the Nike Dunk SB collection, aimed towards skateboarders in California. The associated shoe designs differed from the previous SB Dunk range in that they were designed specifically for skateboarding.