Complex sentence: The Second Philadelphia Mint opened in 1833, with up-to-date technology, except in the coining process, in which it used the transplanted machinery of its predecessor, using muscle power to strike coins.
Split into simpler sentences: The Second Philadelphia Mint opened in 1833, with up-to-date technology, except in the coining process. In this, it used the transplanted machinery of its predecessor, using muscle power to strike coins.