Complex sentence: There is no compelling evidence that such trans-Atlantic contacts ever took place and that there are no generally accepted artifacts of African provenance in the Americas, and scholarly consensus confines such hypotheses to the realm of pseudohistory.
Split into simpler sentences: There is no compelling evidence that such trans-Atlantic contacts took place and that there are no generally accepted artifacts of African provenance in the Americas. Scholarly consensus confines such hypotheses to the realm of pseudohistory.