Complex sentence: Born in Leipzig, Karl Liebknecht was the son of Wilhelm Liebknecht and his second wife Natalie (née Reh), who also came from a family with a strong political background; her father Karl was a member of the Frankfurt Parliament of 1848.
Split into simpler sentences: Born in Leipzig, Karl Liebknecht was the son of Wilhelm Liebknecht and his second wife Natalie (née Reh). Karl's mother also came from a family with a strong political background; her father Karl was a member of the Frankfurt Parliament of 1848.