Complex sentence: Fo soon deserted with the aid of false documents and wandered around for a while before joining a parachute squadron, which he then deserted as well, prompting a further unsuccessful search for the Resistance movement during which he slept rough in the countryside.
Split into simpler sentences: Fo soon deserted with the aid of false documents and wandered for a while before joining a parachute squadron. He then deserted this as well, prompting a further unsuccessful search for the Resistance movement during which he slept rough in the countryside.