Complex sentence: Europeans first sighted the Alaskan coast line in 1732 by the Russian Ivan Fedorov near Cape Prince of Wales (no landing); the first land fall took place in the southern Alaska in 1741 during the Russian exploration conducted by Vitus Bering and Aleksei Chirikov.
Split into simpler sentences: Europeans first sighted the Alaskan coast line in 1732; sighting was made by the Russian Ivan Fedorov near Cape Prince of Wales, but did not land. The first landfall took place in southern Alaska in 1741 during the Russian exploration conducted by Vitus Bering and Aleksei Chirikov.