The first car appeared on British roads in 1888
The year 1888 marks the first appearance of a car in Britain. It doesn't mean that this vehicle was invented in Britain, so your sentence
In the eighteen century, the first car had discovered in British
could be omitted. Also, "discover" is wrongly used here.
While
-> Meanwhile
In the eighteen century, the first car had discovered in British. Then, over a hundred years, the number of vehicles increased to 29 million in 2000. While critics claim that the number of alternative transportation should be improved and British Governments have a rule to maintain using of private cars. Personally, I agree that the government's policy should make limited number for using vehicle and give solution for urban and environmental problem.
Since the nineteenth century, the number of private cars has increased dramatically in Great Britain. In my opinion, car ownership should be controlled by not only the introduction of international laws but also the shift to other means of transport.