Complex sentence: The monthly magazine began publication on 21 May 1951 (Nepal Sambat 1071 Bachhala), coinciding with the festival of Swanya Punhi, the "full moon day of flowers" marking the anniversary of the Buddha's birth, enlightenment and nirvana.
Split into simpler sentences: The monthly magazine began publication on 21 May 1951 (Nepal Sambat 1071 Bachhala). The inaugural issue coincided with the festival of Swanya Punhi, the "full moon day of flowers" marking the anniversary of the Buddha's birth, enlightenment and nirvana.