Complex sentence: Elizalde soon received backing from the Biada brothers, and began building complete cars; the first prototype, called the Tipo 11, made its debut in July 1914, covering the route between Barcelona, Zaragoza, Guadalajara and Madrid in 13 hours.
Split into simpler sentences: Elizalde soon received backing from the Biada brothers, who began building complete cars. It covered the route between Barcelona, Zaragoza, Guadalajara and Madrid in 13 hours.