Very, very broadly: England conquered Ireland roughly 800 years ago and took it as part of the Empire,...Please note that England never conquered Ireland at this time. Rather, the same people who conquered England in 1066 conquered Ireland in 1169. They were Norman, not English.
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how it started - Background of the Troubles
which factions are on what side - see under Belligerents here
how this led to violence - The beginnings of the Troubles in the late 60s
how it played out in everyday life - Social Repercussions
If you don't get on with Wikipedia, there are plenty of other resources. The BBC has a decent section, covering your 'how did it start' and 'who is on which side' questions well. The Guardian has an interactive history you might find useful. Insight on Conflict have a brief overview with the key parties and a timeline.
Here's an article about how popular culture has attempted to talk about the Troubles.
posted by Busy Old Fool at 2:40 AM on July 7, 2012 [1 favorite]