Complex sentence: Turning into an extropical storm, Allison skirted the east coast, bringing gusty winds and heavy rains before entering the Atlantic and moving upward towards Canada, there the storm skirted Nova Scotia as it turned westward and dissapated west of Greenland.
Split into simpler sentences: Turning into an extratropical storm, Allison skirted the east coast, bringing gusty winds and heavy rains before entering the Atlantic and moving northward towards Canada. The storm skirted Nova Scotia as it turned westward and dissipated west of Greenland.