Complex sentence: The core developers called for a temporary halt to transactions, sparking a sharp sell-off and normality was restored only when the majority of the network downgraded to version 0.7 of the Bitcoin software from the flawed version 0.8.
Split into simpler sentences: The core developers called for a temporary halt to transactions, sparking a sharp sell-off. Normality was restored only when the majority of the network downgraded to version 0.7 of the Bitcoin software from the flawed version 0.8.