Complex sentence: In one such example, a Knoevenagel condensation of benzaldehyde with nitroethane yields a nitropropene derivative followed by reduction of the double bond and nitro group through either catalytic hydrogenation or by treatment with lithium aluminium hydride (method 4).
Split into simpler sentences: In one such example, a Knoevenagel condensation of benzaldehyde with nitroethane yields a nitropropene synthetic intermediate. The double bond and nitro group of these intermediate is reduced using either catalytic hydrogenation or by treatment with lithium aluminium hydride (method 4).