Complex sentence: The Student's Interactive Society (SIS) is the main student body at SLIIT, the Society organizes student activities which includes the annual Freshers Night Dance, the Sports day and the Colours Night.
Split into simpler sentences: The Student's Interactive Society (SIS) is the main student body at SLIIT. The society organizes student activities which includes the annual Freshers Night Dance, the Sports day and the Colours Night.