Intense, infrequent, long precipitation events are most likely to produce floods capable of causing channel change.
(infrequent, long precipitation events; are; most likely to produce floods capable of causing channel change) (infrequent, long precipitation events; to produce; floods capable of causing channel change)
infrequent, long precipitation events infrequent, long precipitation events
are to produce
most likely to produce floods capable of causing channel change
floods capable of causing channel change