Complex sentence: It is home to the headquarters of both Pratt & Whitney Canada and Héroux-Devtek.Pratt & Whitney Canada is Longueuil's top employer with 5,000 employees, while Héroux-Devtek has 550 employees.
Split into simpler sentences: It is home to the headquarters of both Pratt & Whitney Canada and Héroux-Devtek. With five thousand employees, Pratt & Whitney Canada is Longueuil's top employer, while Héroux-Devtek has 550 employees.