Complex sentence: Extreme Market Volatility Condition, is a mechanism used by the New York Stock Exchange to slow down trading during a panic, as the designated market makers do not have to disseminate price indications prior to the opening bell.
Split into simpler sentences: Extreme Market Volatility Condition, is a mechanism used by the New York Stock Exchange to ease market opening while volatility is high. It may have the effect of slowing down trading during a panic, as the designated market makers do not have to disseminate price indications prior to the opening bell.