When was the last time a team competed at the Olympic Games comprising members from different countries?

Answer 1

1992
In 1992, a year after the Union of Soviet Socialist Republics (USSR) dissolved, a mixed or combined team competed which comprised competitors from former USSR states. In 1912 a combined team competed comprising Australians and New Zealanders. In the Games 1896 to1904 there was no requirement for teams to represent a single country and several mixed teams competed.