Complex sentence: Maps provided to soldiers on the ground were tourist maps which military grid reference lines were drawn by hand to report locations of units and requesting artillery and aircraft Fire Support, they also did not show topography, and were not marked with crucial positions.
Split into simpler sentences: Maps provided to soldiers on the ground were tourist maps on which military grid reference lines were drawn by hand to report locations of units and request artillery and aircraft fire support. They also did not show topography and were not marked with crucial positions.