Complex sentence: The Cup was originally estabilished by one of the oldest Finnish yacht clubs, "Nyländska Jaktklubben" (NJK) in 1919, to celebrate newly achieved Finnish independence, promote sailing and improve relations between Finnish and Swedish yacht racers.
Split into simpler sentences: The Cup was estabilished by one of the oldest Finnish yach clubs, the "Nylandska Jaktklubben" (NJK) in 1919. It aim was to celebrate newly achieved Finnish independence, promote sailing and improve relations between Finnish and Swedish yacht racers.