Complex sentence: The Schuylkill Fishing Company of Pennsylvania, also known as the State in Schuylkill, was the first angling club in the American Colonies and remains the oldest social club in the English-speaking world.
Split into simpler sentences: The Schuylkill Fishing Company of Pennsylvania, also known as the State in Schuylkill, was the first angling club in the American Colonies. Still in existence, it is the oldest social club in the English-speaking world.