Simplify the following text for a Grade 9 native English-speaking person.
Original: The 12th named storm of the season , Laura formed out of a large extratropical area of low pressure located about 1015 miles ( 1635 km ) west of the Azores on September 29 .
Simplified: Laura formed out of a large non-tropical low pressure area located 1015 miles ( 1635 km ) west of the western islands of the Azores on September 29 .