Complex sentence: Born to an aristocratic Swedish family, he married his Danish cousin Karen Blixen (better known by her pen name Isak Dinesen) in 1913 and they moved to Kenya, where they bought a coffee plantation.
Split into simpler sentences: Born to an aristocratic Swedish family, he married his Danish cousin Karen Blixen (better known by her pen name Isak Dinesen) in 1913. The couple then moved to Kenya, where they bought a coffee plantation.