Complex sentence: Due to rapid construction, patients had large private rooms even as overcrowding became an issue at other hospitals, leading many historians to conclude that the Brattleboro Retreat is among few long-established psychiatric hospitals with an unblemished history.
Split into simpler sentences: Due to rapid construction, patients had large private rooms even as overcrowding became an issue at other hospitals. This has led many historians to conclude that the Brattleboro Retreat is among few long-established psychiatric hospitals with an unblemished history.