Complex sentence: The Delta S4 was the first such example of this technology; contemporary turbochargers were inefficient, as they did not spool up at low revs and this produced the phenomenon known as turbo lag, and this affected driveability-an important aspect of a rally car.
Split into simpler sentences: The Delta S4 was the first such example of this technology. This phenomenon, known as turbo lag, negatively affects driveability, an important aspect of a rally car.