Complex sentence: Traditionally this is understood as Nirvana, cessation, in the sense of the four noble truths, and according to the traditional account of his life he continued to teach for nearly 45 years after he realized Nirvana.
Split into simpler sentences: Traditionally this is understood as Nirvana, cessation, in the sense of the four noble truths. According to the traditional account of his life he continued to teach for nearly 45 years after he realized Nirvana.