Complex sentence: The family moved to London in 1896 and Nicholson was educated at Tyttenhangar Lodge Preparatory School, Seaford, Heddon Court, Hampstead and then as a boarder at Gresham's School, Holt, Norfolk.
Split into simpler sentences: The family moved to London in 1896 and Nicholson was educated at Tyttenhangar Lodge Preparatory School, Seaford, Heddon Court, Hampstead. Nicholson then as a boarder at Gresham's School, Holt, Norfolk.