HI,
Channel 4 are NOT censoring "Sleeper Cell". Instead of airing 10 individual hour-long episodes, they are joining them together, into 5 two-hour movies (well, 105 minutes each), instead, so that the channel can air them in the space of 5 weeks before the major Autumn TV schedules starts to kick-in. Thus, each episode will be approximately 100-105 minutes long, and actually you are simply getting episodes grouped together, e.g. 1 and 2, 3 and 4, etc, etc.
Also, because of the subject matter, e.g. terrorism, Islam, etc, Channel 4 are desperately hoping that the show won't get them too much bad press coverage, for "insensitivity" by airing this series, whilst the current news events are still playing out in the UK, the USA, and in the East.
Pooch