Complex sentence: The National Cadet Corps (N.C.C.) is a part of the children's extracurricular activities and students participate in the (Republic Day Parade RDC), which is held at New Delhi on 26 January every year (The Republic Day of India).
Split into simpler sentences: The National Cadet Corps (N.C.C.) is a part of the children's extracurricular activities. Students participate in the (Republic Day Parade RDC), which is held at New Delhi on 26 January every year (The Republic Day of India).