Complex sentence: They set off again, deciding to arm themselves at Mickey's gun cache, however the group realise the car is inadequate for ferrying the pensioners, so Katy hot-wires a traditional red London double-decker bus.
Split into simpler sentences: They set off again, deciding to arm themselves at Mickey's gun cache. However, the group realise the car is inadequate for ferrying the pensioners, so Katy hot-wires a traditional red London double-decker bus.