Complex sentence: Hart Island was sold to New York City in 1869 Later that year, a 24-year-old woman named Louisa Van Slyke became the first person interred in the island's graveyard.
Split into simpler sentences: Hart Island was sold to New York City in 1869. In 1869, a 24-year-old woman named Louisa Van Slyke became the first person interred in the island's graveyard.