Complex sentence: In 1923 the S.E.C.N. start the desing of a new serie of 6 submarines modified the class Holland 105F under licensse by Holland Boat & Co. The new desing, consist in inprove the B-Class in capabilities, but they, has got one great problem.
Split into simpler sentences: In 1923 the S.E.C.N. sart the desing of a new serie of 6 submarines modifies the class Holland 105F under licensse Holland Boat. The ew desing, consist in inprove the B-Class in capabilities, but they, has got one great problem.