Complex sentence: On 1 August, the division was withdrawn from the front line for rest and rear-guard patrol duty, after which the division was assigned to VI Corps of the Fifth United States Army, in preparation for the invasion of mainland Italy.
Split into simpler sentences: On 1 August, the division withdrew from the front line for rest and rear-guard patrol duty. The division was assigned to VI Corps of the Fifth United States Army, in preparation for the invasion of mainland Italy.