Complex sentence: Though in late in life to do so, this decision was a good one as he and his elder brother, John Craig, who was a lawyer, formed an effective partnership in managing money, loans, merchandise and property.
Split into simpler sentences: Though in late in life to do so, this decision was a good one as he and his elder brother, John Craig, who was a lawyer. Together the Craigs formed an effective partnership in managing money, loans, merchandise and property.