Complex sentence: The result was their first sports car (the Djet was a René Bonnet design) M530, named after Matra's R530 missile, designed by former Simca designer Philippe Guédon.
Split into simpler sentences: The result was the first "true" Matra sports car (the Djet had been a René Bonnet design) the Matra M530. The car was named after Matra's R530 missile, and designed by a former Simca designer called Philippe Guédon.