Complex sentence: The flight was originally destined for Washington National Airport, but was diverted to Dulles when high crosswinds, east at and gusting to, prevented safe operations on the main north-south runway at Washington National.
Split into simpler sentences: The flight was originally destined for Washington National Airport. However, the plane diverted to Dulles when high crosswinds, east at 28 knots (52 km/h) and gusting to 49 knots (91 km/h), prevented safe operations on the main north-south runway at Washington National.