Complex sentence: He had heard about a new island which Garðarr Svavarsson, Flóki Vilgerðarson and others had found in the Atlantic Ocean and with his close friend Hjörleifr Hróðmarsson, he sailed for Iceland.
Split into simpler sentences: He had heard about a new island which Garðarr Svavarsson, Flóki Vilgerðarson and others had found in the Atlantic Ocean. With his close friend Hjörleifr Hróðmarsson, he sailed for Iceland.