Complex sentence: St. Mary's Church Feast is a grand occasion spread over two days (October 2nd and 3rd) and marked by music and festivities and a colourful procession in which more than 40 caparisoned elephants participate.
Split into simpler sentences: St. Mary's Church Feast is an occasion spread over October 2nd and 3rd. It is marked by music and festivities and a colourful procession in which more than 40 caparisoned elephants participate.