" playing sports are [is] wonderful, of which you had no idea" - druga cz. zdania niepoprawna, nie nawiązuje do pierwszej, chyba że nie zrozumiałam pierwszej,
"you catch a wife" - the wife...,
"and as soon as [you can] you run"
"Finns have invented this game and it was there every year there are World Championships" - Finns have invented this game and play it every year, they even organize W.C., lub inaczej,
"Currently holds the title couple from Estonia" zły szyk