Complex sentence: Several plans and memoranda for a Flanders offensive were produced between January 1916 and May 1917, in which the writers tried to relate the offensive resources available to the terrain and the likely German defence.
Split into simpler sentences: Several plans and memoranda for a Flanders offensive were produced between January 1916 and May 1917. A number of studies in 1916 and 1917 tried to relate the offensive resources available to the terrain and the likely German defence.