Complex sentence: In early July the 9th Army was reinforced so that it could conduct operation Seydlitz reaching a total of 22 divisions including 4 Panzer divisions organised in 5 higher corps headquarters.
Split into simpler sentences: In early July the 9th Army was reinforced so that it could conduct Operation Seydlitz. It reached a total of 22 divisions, including 4 Panzer divisions organised in 5 higher corps headquarters.