( Tornadoes ( ( can ( ( ( form anywhere ) , ) ( ( ( ( at ( ( any time ) ( of ( the day ) ) ) ) , ) and ) ( at ( ( any time ) ( of ( the year ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB form) (ADVP (RB anywhere)) (, ,) (PP (PP (IN at) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN day))))) (, ,) (CC and) (PP (IN at) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN year)))))))) (. .)))
Tornadoes can form anywhere, at any time of the day, and at any time of  the year.
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN in) (NP (DT any))))) (. .)))