Complex sentence: He was the one providing her with an allowance after the death of their father George and provided Gertrude with means until she received an a substantial amount from her cousin who died far off in service of the East India Company.
Split into simpler sentences: He was the one providing her with an allowance after the death of their father. George provided Gertrude with means until she received a substantial amount from her cousin who died far off in service of the East India Company.