Complex sentence: In 1911 the company was renamed Vickers ltd, and in 1927 became Vickers Armstrongs ltd after a merger with Armstrong Whitworth, whose shipyard at High Walker on the River Tyne became the "Naval Yard".
Split into simpler sentences: In 1911 the company was renamed Vickers ltd and became Vickers Armstrongs ltd in 1927 after a merger with Armstrong Whitworth. The latter organisation's shipyard at High Walker on the River Tyne became the "Naval Yard".