This sign tells you a number of things:
Clementines are for sale. Singular in Italian is clementina. Plural is clementine. In other words the final a changes to e. This is how most words that are feminine (that take la as the article) become plural. You also have to change the article la to le.
They cost 3.5 euros per kilo. Note how in Italian the comma is used 3,5 euro. Euro is technically a made up word. The plural is the same: un euro and dieci euro. In English we add an s: one euro, ten euros.
The clementines come from (provenienza) Spain (Spagna). They look good.

The word for strawberries is fragole. Notice here that it is fragoloni (the ending tells you that the strawberries are nice and big).
Provenienza tells you their provenance (where they come from). Italians are keen on local produce so Italia is good.

Here is a sign for different flavoured meringues (yum!). Notice how meringue is spelt in Italian. The h is included to keep the hard sound of g. Just like the u has been included in English.
Miste = mixed
1 x the bracket with 2 lines across it = 3.50 euro per 1 (or more simply 3.5 euro each).
In Italian the x sign usually means per.