Complex sentence: Thomas Alexander Browne, whose wrote under the pseudonyn Rolf Boldrewood, was the author of'Robbery Under Arms' was the son of Captain Sylvester Brown, and was a resident of Baynton as a young boy.
Split into simpler sentences: Thomas Alexander Browne, whose wrote under the pseudonyn Rolf Boldrewood, and authored'Robbery Under Arms'. Thomas Browne was the son of Captain Sylvester Brown, and was a resident of Baynton as a young boy.