Complex sentence: Mid 20th century saw a decline in the occupations of the people of Kilakarai, with the advent of the surface transport the Merchant Navies of Kilakarai faded away.
Split into simpler sentences: Mid 20th century saw a decline in the occupations of the people of Kilakarai. With the advent of the surface transport the Merchant Navies of Kilakarai faded away.