Complex sentence: He will join the newly formed Haas F1 team for 2016, where he will be joined by former Sauber driver Esteban Gutiérrez, who will return to competition after spending a season as Ferrari's test and reserve driver.
Split into simpler sentences: He will join the newly formed Haas F1 team for 2016, where he will be joined by former Sauber driver Esteban Gutiérrez. Gutiérrez will return to competition after spending a season as Ferrari's test and reserve driver.