Complex sentence: He was also born with heterochromia, a condition that causes the irises of the eyes to be different colors; in Aykroyd's case, his right eye is blue and his left is brown.
Split into simpler sentences: He was also born with heterochromia, a condition that causes the irises of the eyes to be differently colored. In Aykroyd's case, his right eye is blue and his left is brown.