Complex sentence: Linus Pauling proposed that the double bond results from two equivalent banana bonds, while Hückel proposed the currently prevailing view, as presented in most textbooks, which represents the double bond as a combination of a sigma bond plus a pi bond.
Split into simpler sentences: Linus Pauling proposed that the double bond results from two equivalent bonds, Linus Pauling. Erich Hückel proposed a representation of the double bond as a combination of a sigma bond plus a pi bond.