Complex sentence: Olympiacos had a great season both domestically and internationally; in Europe, they were drawn in Group C of the 2013--14 Champions League against Paris Saint-Germain, Benfica and Anderlecht.
Split into simpler sentences: Olympiacos had a great season both domestically and internationally. In Europe, they were drawn in Group C of the 2013--14 Champions League alongside Paris Saint-Germain, Benfica and Anderlecht.