Complex sentence: Their second child, born a year later, was a boy diagnosed with Rh incompatibility who died at two days of age; accounts vary as to whether his death resulted from complications of Rh incompatibility or from choking on his own mucus.
Split into simpler sentences: Their second child, born a year later, was a boy diagnosed with Rh incompatibility who died at two days of age. Accounts vary as to whether his death resulted from complications of Rh incompatibility or from choking on his own mucus.