Complex sentence: They are the only team outside of the United States to win the World Series, and are currently the only Major League Baseball team outside the United States after the Montreal Expos moved to Washington, D.C. and became the Washington Nationals.
Split into simpler sentences: They are the only team outside of the United States to win the World Series. The Blue Jays are currently the only MLB team outside the United States after the Montreal Expos moved to Washington, D.C. and became the Washington Nationals.