Complex sentence: In 1636, Nix's Mate was granted to John Gallop, a harbor pilot who lived on nearby Gallops Island and used the then 12 acre island for grazing his sheep.
Split into simpler sentences: In 1636, Nix's Mate was given to John Gallop, a harbor pilot who lived on nearby Gallops Island. Gallop used the then 12 acre island for grazing his sheep.