Add punctuation: When they finally returned to Denmark their apartment had been rented out to someone else
A: When they finally returned to Denmark, their apartment had been rented out to someone else.

Add punctuation: on Thursday 12th at 1200 Stefano Zacchiroli will give a talk in English titled Debian 18 years and counting
A: on Thursday 12th at 12:00 Stefano Zacchiroli will give a talk (in English) titled Debian, 18 years and counting

Add punctuation: To review the transfer price from Potenza Picena to Rome International airport Fiumicino Ciampino or to other cityairport select the required destination point If you did not find your town of interest in the below routes please send us a request from the page Order
A:
To review the transfer price from Potenza Picena to Rome, International airport Fiumicino, Ciampino or to other city/airport, select the required destination point. If you did not find your town of interest in the below routes, please send us a request from the page Order.