Complex sentence: At the same time Fawdry established a small toy museum above the shop; this became Pollock's Toy Museum which today it is small private museum run by the founder's grandson, Eddy Fawdry.
Split into simpler sentences: At the same time Fawdry established a small toy museum above the shop. This became Pollock's Toy Museum; today it is small private museum run by the founder's grandson, Eddy Fawdry.