Complex sentence: After her brother, Abraham Lincoln II, died on March 5,1890 in London at the age of 16, the family decided three years later to return to America, ultimately to Mary Eunice Harlan's mother's residence in Mount Pleasant, Iowa.
Split into simpler sentences: After her brother, Abraham Lincoln II, died on March 5,1890 in London at the age of 16, the rest of the family decided three years later to return to America. They returned to the states and then went to Mary Eunice Harlan's mother residence in Mount Pleasant, Iowa.