Complex sentence: Her father, John Brunham, was a merchant in Lynn, five-time mayor, Member of Parliament and merchant whose fortunes may have been negatively affected by downturns in the economy, especially in the wool trades, of the 1390s.
Split into simpler sentences: Her father, John Brunham, was a merchant in Lynn, five-time mayor, and Member of Parliament. His mercantile fortunes may have been negatively affected by downturns in the economy, especially in the wool trades, of the 1390s.