Complex sentence: HSC "Speedrunner IV" is a fast ferry operated by Aegean Speed Lines between Pireaus, Serifos, Sifnos and Milos.
Split into simpler sentences: HSC "Speedrunner IV" is a fast ferry owned and operated by Aegean Speed Lines. She is used on a service between Pireaus, Serifos, Sifnos and Milos.