Complex sentence: In 1910, after the death of Edward VII, Mrs Keppel made her family observe a "discretion" leave of about two years before re-establishing themselves in British society: upon returning, the Keppels moved to another address (Grosvenor Street).
Split into simpler sentences: In 1910, after the death of Edward VII, Mrs Keppel made her family observe a "discretion" leave of about two years before re-establishing themselves in British society. When they returned, the Keppels moved to another address (Grosvenor Street).