Original sentence: It may have been the island Guanahani that Christopher Columbus discovered in 1492 and renamed San Salvador, though this is disputed by some.Watling Island was officially named San Salvador in 1925 after several scholars had argued that its features best matched Columbus' island
Edited sentence: It may have been the island Guanahani that Christopher Columbus discovered in 1492 and renamed San Salvador, but this is now considered unlikely.Watling Island was officially named San Salvador in 1925 when certain scholars put forward that this was Columbus' island