Complex sentence: A Mr Emerson interrupts their "peevish wrangling", offering to swop rooms as he and his son, George Emerson, look over the Arno, to Miss Bartlett's consternation, this behaviour being seen as impolite.
Split into simpler sentences: A Mr Emerson interrupts their "peevish wrangling", offering to swop rooms as he and his son, George Emerson, look over the Arno. This causes Miss Bartlett some consternation, this behaviour being seen as impolite.