Complex sentence: That function came to an end in 1675 during King Philip's War when residents were first confined to their villages (thus restricted from their farms and unable to feed themselves), and many were confined on Deer Island in Boston Harbor.
Split into simpler sentences: That function came to an end in 1675 during King Philip's War. Instead, residents were first confined to their villages (thus restricted from their farms and unable to feed themselves), and many were confined on Deer Island in Boston Harbor.