( But ( , ( ( ( season or ) not ) ( , ( tornadoes ( ( can ( ( ( occur ( at ( ( any time ) ( of ( the year ) ) ) ) ) , ) ( if ( ( the ( weather conditions ) ) ( are right ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (CC But) (, ,) (ADVP (RB season) (CC or) (RB not)) (, ,) (NP (NNS tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN at) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN year))))) (, ,) (SBAR (IN if) (S (NP (DT the) (NN weather) (NNS conditions)) (VP (VBP are) (ADJP (JJ right))))))) (. .)))
But, season or not, tornadoes can occur at any time of the year, if the weather conditions are right.
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN in) (NP (DT any))))) (. .)))