Complex sentence: The museum moved to its current location in 1969 after the Market Hall had been completely refurbished a redesigned after the entire central part of the Market Hall building was destroyed by a fire in 1963.
Split into simpler sentences: The museum moved to its current location in 1969 after the Market Hall had been completely refurbished and redesigned. The entire central part of the Market Hall building had been destroyed by a fire in 1963.