Complex sentence: She was operated from 1944 until 1946 by the Royal Navy as HMS "Donovan", before reverting back to the Ministry of War Transport in 1946 and being renamed "Empire Battleaxe".
Split into simpler sentences: She was operated from 1944 until 1946 by the Royal Navy, when she was called HMS "Dovovan". In 1946 she reverted back to the Ministry of War Transport and "Empire Battleaxe".