Complex sentence: Willem Coucheron (or "Wyllem Coucheron") was a Dutch-born Dano-Norwegian quartermaster general who began the construction of the fortifications at Fredrikstad, Norway in 1663.
Split into simpler sentences: Willem Coucheron (or "Wyllem Coucheron") was a Dutch-born Dano-Norwegian quartermaster general. Norsk Biografisk Leksikon, bind 3 He began the construction of the fortifications at Fredrikstad, Norway in 1663.