Complex sentence: On 18 April 1944, the 1st Provisional Marine Brigade was again activated, this time at Guadalcanal, and placed in reserve for a time, commanded by Brigadier General Lemuel C. Shepherd.
Split into simpler sentences: On 18 April 1944, the 1st Provisional Marine Brigade was again activated, this time at Guadalcanal. The brigade at this point was commanded by Brigadier General Lemuel C. Shepherd.