original: A new frontal ridge had formed on August 17 which caused the storm to drift in a westerly direction.
simplifications: A new frontal area formed on August 17 which made the storm move west. The storm drifted west because of a frontal ridge on August 27th. A new frontal ridge had formed on August 17. This caused the storm to drift westward. A new frontal ridge had formed on August 17. This made the storm drift westward. A new frontal ridge formed August 17. It made the storm drift west. A new frontal ridge formed, which caused the storm to move west. A new frontal ridge had formed which made the storm go in a westerly direction. On August 17th a new front ridge formed. This caused the storm to drift west. A new frontal ridge was created on August 17, which caused the storm to drift in the west. A new frontal ridge had formed on August 17 which caused the storm to move in a westerly direction.