Complex sentence: Setting out on June 2 1595, the voyage went between the Siberian coast and Vaygach Island, before being forced to turn back upon discovering that unexpected weather had left the Kara Sea frozen.
Split into simpler sentences: Setting out on June 2 1595, the voyage went between the Siberian coast and Vaygach Island. Eventually, the expedition turned back upon discovering that unexpected weather had left the Kara Sea frozen.