(brak przedimka) Prince 'has' (tutaj czas przeszly 'had') looked for Snow White 'since' (dalabym 'for a') long time.
He didn't know what 'was'(zle slowo, tutaj 'had') happenED with her. Meanwhile (pzedimek) dwarfs waited 'when' (cos mi tu nie pasuje, napisz gdzie oni czekali) their beautiful friend was 'recovered' (nie za bardzo, lepiej slowo 'found' znaleziona).
The evil queen was happy because she became the most beautiful 'women' (tutaj daj l. poj) in the world again. One day when (przedimek) Prince walked in the forest he found a small house. He was curious of that place and he decided to check who 'lives' (daj 'lived') there.