Complex sentence: The OON was awarded by the Queen of the Netherlands on a visit to London in 1950 and the Order of St Olave on a state visit of the King of Norway to Edinburgh in 1962.
Split into simpler sentences: The OON was awarded by the Queen of the Netherlands on a visit to London in 1950. The Order of St Olave was awarded on a state visit of the King of Norway to Edinburgh in 1962.