newgeneration, Cyprus had to fight against both the Turks and the British to liberate itself. So it is hardly convincing when you present Turkish and British propaganda as supposedly "facts".
The reason why Cyprus is Divided is simple: This is what suited the geopolitical interests of Britian and Turkey, who wanted (and continue to want) to maintain troops and control over our island.
The Turkish minority in Cyprus was merely used as an excuse by the above mentioned Imperialists to get what they wanted from our island. They did this by promising to the Turkish minority privileges and gains on the expense of every other Cypriot. We have many other minorities in Cyprus and we live in peace with them as equal Cypriots without any problems. The TCs could be just like every other minority in Cyprus (and like every other minority in general) and there would be no conflicts or problems with them either.
The Turkish propagandists claim that the Cyprus Problem didn't start in 1974 and they try to excuse the Turkish invasion with events that took place a whole decade earlier. What those propagandists "forget" is that the Cyprus problem didn't start in 1963 either. The conflict between GCs and TCs started in the 50s, when TCs burned down GC homes and shops and committed massacres against innocent GCs.
It should come to no surprise that when attacked and when having their democratic rights taken away the GCs would react and fight back. Who wouldn't? Would the Turks in Turkey tolerate any minority if it attacked them and demanded to have privileges and gains on the expense of the majority of the population? Of course not. Neither the Turks nor any other nation would ever accept that. Ethnic minorities are entitled to their human and democratic rights, and maybe some additional minority rights, but have no right to commit terrorist attacks against the majority and demand undemocratic privileges and gains on the expense of everybody else. (Here is should be noted that Turkey doesn't even give what it should to its own minorities)
Therefore the "Why is Cyprus divided" and how "How Cyprus can be unified" are questions that can be given the same answer: Cyprus was divided because Britain and Turkey promised to the TC minority privileges and gains on the expense of every other Cypriot and they armed them so they could pursue this goal. Cyprus will be unified only when these Imperialists stop supporting the division of Cyprus for their own interests, and allow the TC minority to be intergraded into the Cypriot population like is the case with all other minorities in Cyprus and all other minorities in all other successful multi-ethnic democracies in the world.