Complex sentence: The eldest, Olive Christiana, (1881-1936) was born and grew up on the family's Potternewton Hall Estate and was educated at Roedean, boarding at the school until 1900.
Split into simpler sentences: The eldest, Olive Christiana, (1881-1936) was born and grew up on the family's Potternewton Hall Estate. Olive was educated at Roedean, boarding at the school until 1900.