Complex sentence: The Allcroft family faced increasing financial difficulty in the 20th century and the castle was formally opened for visitors in 1908, with much of the revenue reinvested in the property, but funds for repairs remained in short supply.
Split into simpler sentences: The Allcroft family faced increasing financial difficulty in the 20th century. Stokesay Castle was formally opened for visitors in 1908, with much of the revenue reinvested in the property, but funds for repairs remained in short supply.