Complex sentence: The Sierra was released in Europe in September 1981, and the performance-oriented XR4i appeared in 1983, slotted into the lineup above the Fiesta-based XR2 and Escort-based XR3.
Split into simpler sentences: The Sierra was released in Europe in September 1981. The performance-oriented XR4i appeared in 1983, slotted into the lineup above the Fiesta-based XR2 and Escort-based XR3.