Complex sentence: Since the 2010 tournament, the Pacific Nations Cup has been a four-team tournament, contested by Japan, Fiji, Samoa and Tonga, with Samoa winning in 2010 and Japan in 2011.
Split into simpler sentences: Since the 2010 tournament, the Pacific Nations Cup has been a four-team tournament, contested by Japan, Fiji, Samoa and Tonga. The 2010 and 2011 tournaments saw only the three Pacific Island nations and Japan compete, with Samoa winning in 2010 and Japan in 2011.