Complex sentence: Xenon is a trace gas in Earth's atmosphere, occurring at 87 ± 1 parts per billion (nL/L), or approximately 1 part per 11.5 million, and is also found as a component in gases emitted from some mineral springs.
Split into simpler sentences: Xenon is a trace gas in Earth's atmosphere, occurring at 87 ± 1 parts per billion (nL/L), or approximately 1 part per 11.5 million. It is also found as a component of gases emitted from some mineral springs.