Complex sentence: Juan Daniel Mastretta Guzmán is a Mexican engineer and designer founder of Mastretta Design, a design and automotive enterprise considered as developing the first commercial Mexican sports car, the Mastretta MXT in 2008.
Split into simpler sentences: Juan Daniel Mastretta Guzmán is a Mexican engineer and designer founder of Mastretta Design, a design and automotive company. Mastretta was chiefly responsible for the development of the first Mexican sports car, the Mastretta MXT, in 2008.