Complex sentence: U- 36 was a type 31 submarine, being commissioned on the 6th June 1914 under the command of Captain E. Graeff and by July 1915 had sunk 14 merchant ships and taken 3 more as prizes.
Split into simpler sentences: U- 36 was a type 31 submarine commissioned on 6 June 1914 under the command of Captain E. Graeff. By July 1915 she had sunk 14 merchant ships and taken three more as prizes.