Complex sentence: Fletch claims that criminal life to him is something of a career and has been in and out of prison all of his life, including Borstal, Shepton Mallet, Maidstone and Brixton.
Split into simpler sentences: Fletch claims that criminal life to him is something of a career and has been in and out of prison all of his life. Throughout the series, he lists several prisons where he has served time, including Borstal, Shepton Mallet, Maidstone and Brixton.