Complex sentence: He joined the task force planning team at Northwood, and then relieved Brigadier Julian Thompson as ground commander when he arrived with the 5th Infantry Brigade on the QEII on 30 May.
Split into simpler sentences: He joined the task force planning team at Northwood before flying south to take command of land forces in theatre. Moore relieved Brigadier Julian Thompson as ground commander when he arrived with the 5th Infantry Brigade on the QEII on 30 May.