Complex sentence: He continued his education by studying landscape architecture at Harvard University until March 1913, when he and his wife moved to Asia Minor in order to return to the licorice business, a business which his father had already established.
Split into simpler sentences: He continued his education by studying landscape architecture at Harvard University until March 1913. In March 1913, he and his wife moved to Asia Minor in order to return to the licorice business, a business which his father had already established.