Complex sentence: The sea mink was seldom sighted in the years proceeding 1860, with the last recorded kill of a sea mink in Maine made in 1880 near Jonesport, and the last known kill made in Campobello Island in New Brunswick in 1894.
Split into simpler sentences: The sea mink was seldom sighted in the years proceeding 1860. The last recorded kill of a sea mink in Maine was made in 1880 near Jonesport, and the last known kill was made in Campobello Island in New Brunswick in 1894.