Complex sentence: Mrs Donoghue had been enjoying an ice cream with ginger beer her friend had bought her in Mr Minchella's café in Paisley, when she emptied the opaque ginger beer bottle out and the decomposing remains of a snail emerged.
Split into simpler sentences: Mrs Donoghue had been enjoying an ice cream with bottle of ginger. Her friend had bought her the ice cream float in Mr Minchella's café in Paisley, when she emptied the opaque ginger bottle out and the decomposing remains of a snail emerged.