Complex sentence: Habbie is also the main focus of the celebration of Lilias day which is the famous local holiday celebrated on the first Saturday in June during which hundreds of visitors come to Kilbarchan to watch the parade and join in the festivities.
Split into simpler sentences: Habbie is also the main focus of the celebration of Lilias day. Hundreds of people flock to Kilbarchan to watch the parade and join in the festivities.