"C'est le seul système de ce type en France."
Translation:It is the only system of this type in France.
Just to clarify the use of the apostrophe ( ' ) in English:
it is used to form contractions, e.g., it is = it's
it is used to show possession with nouns, e.g., the child's toy, the man's car
possessive pronouns (his, hers, its, ours, yours, theirs) do not use an apostrophe. So "It's the only system of its (not its' and not it's) type...."