Complex sentence: As early as 6 July, "Stavka" decided to send the 2nd and 10th Tank Corps and the 5th Guards Tank Army to the southern sector; a day later, other formations got their marching orders.
Split into simpler sentences: As early as 6 July, "Stavka" decided to send the 2nd and 10th Tank Corps and the 5th Guards Tank Army to the southern sector. A day later, other formations got their marching orders.