Complex sentence: Sifa is short for "Sicherheitsfahrschaltung", German for "safety driving switch", usually a pedal and/or large press button, which monitors the alertness of the driver.
Split into simpler sentences: Sifa is short for "Sicherheitsfahrschaltung", German for "safety driving switch". It is usually a pedal and/or large press button, which monitors the alertness of the driver.