Complex sentence: Through his research, withdrawals occurred within 12 to 24 hours after stopping caffeine intake, but could last as long as nine days and caffeine consumers are more apt to consume to waive off the withdrawal symptoms instead of to enjoy the product.
Split into simpler sentences: Through his research, withdrawals occurred within 12 to 24 hours after stopping caffeine intake and could last as long as nine days. Caffeine consumers are often more apt to consume to waive off the withdrawal symptoms than to enjoy the product.