Complex sentence: Mikle Corp was Google's largest AdSense customer in Japan for 2013 and the company was featured in Google's AdSense 2014 video advertisement campaign, which was aimed at the Japanese market.
Split into simpler sentences: Mikle Corp was Google's largest AdSense customer in Japan for 2013. The company was featured in Google's AdSense 2014 video advertisement campaign, which was aimed at the Japanese market.