Complex sentence: Moore tornado was an extremely powerful F5 tornado in which the highest wind speeds ever measured,, were recorded by a Doppler on Wheels (DOW) radar, which devastated towns just outside of Oklahoma City on May 3,1999.
Split into simpler sentences: Moore tornado was an extremely powerful F5 tornado in which the highest wind speeds ever measured,, were recorded by a Doppler on Wheels (DOW) radar. The tornado devastated towns just outside of Oklahoma City on May 3,1999.