Complex sentence: The Grubb Family Iron Dynasty was a succession of iron manufacturing enterprises owned and operated by Grubb family members for over 165 years, collectively one the largest Pennsylvania iron producers during the Industrial Revolution.
Split into simpler sentences: The Grubb Family Iron Dynasty was a succession of iron manufacturing enterprises owned and operated by Grubb family members for more than 165 years. Collectively, they were among the largest Pennsylvania iron producers during the Industrial Revolution.