Complex sentence: Wales had only been playing as an international country for two years, and the 1883 Championship was the inagural tournament and the fixture between Scotland and Wales was the first rugby encounter between the two countries.
Split into simpler sentences: Wales had only been playing as an international country for two years when the team played in the 1883 Championship. This was the inagural tournament and the fixture between Scotland and Wales was the first rugby encounter between the two countries.