Complex sentence: As a child, he lived in Grays Farm--commonly referred to as the ghetto on the island--with his paternal great-grandmother, who was in her eighties, at the time, partially blind, poor and aging.
Split into simpler sentences: As a child, he lived in Grays Farm which is commonly referred to as the Ghetto on island with his paternal great-grandmother. She at the time, was in her eighties, partially blind, poor and aging.