Rule reminder
Cohesion (coesione) = the formal/grammatical surface links between sentences: pronouns, connectives, ellipsis, lexical devices. A text can have cohesion without coherence (grammatically linked sentences that make no sense together) or coherence without cohesion (logically connected ideas expressed with repetitive or awkward grammar). Both are needed. At B2, you must identify which type of problem affects a given text.
'Il cielo è blu. Tuttavia, mio cugino abita a Milano. Pertanto, ho comprato una pizza.' — What is the problem?