Complex sentence: Owen Lars is the son of farmer Cliegg Lars, the step-brother of Anakin Skywalker, and the step-uncle and de-facto foster father of Luke Skywalker.
Split into simpler sentences: Owen Lars is the son of farmer Cliegg Lars. He is the step-brother of Anakin Skywalker, and the step-uncle and de-facto foster father of Luke Skywalker.