Complex sentence: Aaron McDuffie Moore, graduate of the 1888 class, became the first African-American physician in Durham and co-founded the North Carolina Mutual Life Insurance Company, the largest and oldest black-owned business in the United States.
Split into simpler sentences: Aaron McDuffie Moore, graduate of the 1888 class, became the first African-American physician in Durham. He co-founded the North Carolina Mutual Life Insurance Company, the largest and oldest black-owned business in the United States.