Complex sentence: In November 1939, some Medium Mark IIs were sent to Egypt for experiments being conducted by Major-General Sir Percy Hobart and his Mobile Division (Egypt), but the Vickers Mediums in Egypt were also phased out before Italy declared war in June 1940.
Split into simpler sentences: In November 1939, some Medium Mark IIs were sent to Egypt for experiments being conducted by Major-General Sir Percy Hobart and his Mobile Division (Egypt). But the Vickers Mediums in Egypt were also phased out before Italy declared war in June 1940.