Complex sentence: Occasional flooding of Runnymede and parts of Egham Hythe have taken place following exceptional Thames Valley winter rainfall, including the deployment of units of the army to assist with defences to the main national damage, flooding, flowing from the 2013-14 winter storms.
Split into simpler sentences: Occasional flooding of Runnymede and parts of Egham Hythe have taken place following exceptional Thames Valley winter rainfall. Units of the army were deployed to assist with defences and dealing with damage from flooding in the 2013-14 winter storms.