Complex sentence: Following a period of charge-free conduct, Fairburn went missing during the period 9--16 April 1917 and he remained missing for 10 months, before being arrested just north of Arras.
Split into simpler sentences: Following a period of charge-free conduct, Fairburn went missing during the period 9--16 April 1917. He remained missing for 10 months, before being arrested just north of Arras.