Complex sentence: Further to this event, Corso Imperiale was named Corso 6 Aprile, in memory of the day (6 April) in which the volunteers started to be enlisted in Alcamo.
Split into simpler sentences: Further to this event, Corso Imperiale was named Corso 6 Aprile. Owing to this event, Corso Imperiale changed its name into "Corso VI Aprile" in memory of the day (6 April) in which the volunteers started to be enlisted in Alcamo.