Complex sentence: The attack started with elements of "Totenkopf" crossing the Psel River in the opening hours of 10 July to secure a bridgehead on the northern bank and clear Soviet units and artillery positions that would threaten the flanks of any German advance on Prokhorovka.
Split into simpler sentences: The attack started with elements of "Totenkopf" crossing the Psyol River in the opening hours of 10 July. The aim was to secure a bridgehead on the northern bank and clear Soviet units and artillery positions that would threaten the flanks of any German advance on Prokhorovka.