Complex sentence: His grandfather king Louis-Philippe was ousted out of his throne by the Revolution of 1848 and with only five years old, Gaston left for the exile in Great Britain with the remaining of his family and would only return to his native land in 1878.
Split into simpler sentences: His grandfather king Louis-Philippe was ousted from his throne by the Revolution of 1848. Only five years old at the time Gaston left in exile for the Great Britain with the remainder of his family and would only return to his native land in 1878.