Complex sentence: It falls on the third "Tithi" (lunar day) of Bright Half ("Shukla Paksha") of the pan-Indian month of Vaishakha and is observed regionally by Hindus and Jains in India and Nepal.
Split into simpler sentences: It falls on the third "Tithi" (lunar day) of Bright Half ("Shukla Paksha") of Vaisakha month. It is observed regionally by Hindus and Jains in India and Nepal.