Complex sentence: Their second child, born a year later, was a boy diagnosed with Rh incompatibility who died at age two days, either 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 in just two days. Accounts vary as to whether his death was from complications of Rh incompatibility or from choking on his own mucus.