Complex sentence: In 1872, the Prince Edward Island Railway was constructed, making the port at Alberton (Northport) its western terminus and connecting Alberton with communities to the east such as O'Leary, Summerside, Charlottetown, Georgetown and Souris.
Split into simpler sentences: In 1872, the Prince Edward Island Railway was constructed, making the port at Alberton (Northport) its western terminus. It connected Alberton with communities to the east such as O'Leary, Summerside, Charlottetown, Georgetown and Souris.