Complex sentence: Shanks'eldest child is Tatiana (b. August 1998), from his relationship with model and actress Vaitiare Bandera, who portrayed Sha're, his character's wife, on "Stargate SG-1".
Split into simpler sentences: Shanks'eldest child is Tatiana (b. August 1998). She was conceived from his relationship with model and actress Vaitiare Bandera, who portrayed Sha're, his character's wife, on "Stargate SG-1".