Complex sentence: The Jarrell tornado originally touched down as a weak pencil-like tornado near the Bell-Williamson County line, but its funnel rapidly intensified into a violent 3/4-mile-wide multi-vortex tornado at around 3:45 pm CDT.
Split into simpler sentences: The Jarrell tornado originally touched down as a weak pencil-like tornado near the Bell-Williamson County line. Its funnel rapidly intensified into a violent 3/4-mile-wide multi-vortex tornado at around 3:45 pm CDT.