Complex sentence: The BMW N55 is a turbocharged direct injection straight-6 DOHC piston engine which has been in production since 2009, being initially launched in the BMW 535i Gran Turismo (F07).
Split into simpler sentences: The BMW N55 is a turbocharged direct injection straight-6 DOHC piston engine which has been in production since 2009. It has been in production since 2009, being initially launched in the BMW 535i Gran Turismo (F07).