Complex sentence: Typically wampum beads are tubular in shape, often a quarter of an inch long and an eighth inch wide, but one 17th century Seneca wampum belt featured beads almost 2.5 inches long.
Split into simpler sentences: Typically wampum beads are tubular in shape, often a quarter of an inch long and an eighth inch wide. One 17th-century Seneca wampum belt featured beads almost 2.5 inches long.