Complex sentence: From 21 to 26 February 1916, the fort is bombarded with shells of all sizes including 129 rounds of very large caliber, shooting boxes take damage, armored observatories also take damage, command and will cut the gallery leading to the turret 75.
Split into simpler sentences: From 21 to 26 February 1916, the fort is bombarded with shells of all sizes including 129 large caliber rounds. Pillboxes take damage, armored observatories also take damage, command and will cut the gallery leading to the turret 75.