Complex sentence: The water tower was decommissioned in 1988 and has had multiple owners since, with planning permission granted for an apartment and a public viewing platform, although 19 years have passed and it still stands derelict.
Split into simpler sentences: The water tower was Decommissioned in 1988 and has had multiple owners since, with planning permission granted for an apartment and a public viewing platform. Although 19 years have passed and it still stands derelict.