Complex sentence: During the celebration, two processions one from Thiruvananthapuram and other from Tiruchendur reaches Athala vilai and both the processions goes around (circumambulate) this "Vaikunda Malai" and a Jyothi (flame) is lit at the top of this hill symbolising the birth of Vaikundar.
Split into simpler sentences: During the celebration, two processions, one from Thiruvananthapuram and other from Tiruchendur, reach Athala vilai and circle the hill. A Jyothi (flame) is lit at the top of this hill to symbolise the birth of Vaikundar.