Complex sentence: While most Hindu festivals are celebrated during the day, Shivaratri is celebrated during the night by keeping a "jaagaran"-a night-long vigil with worship, as its believed that Lord Shiva saved the universe from darkness and ignorance.
Split into simpler sentences: While most Hindu festivals are celebrated during the day, Shivaratri is celebrated during the night by keeping a "jaagaran"-a night-long vigil with worship. It is believed that Lord Shiva saved the universe from darkness and ignorance.