Essentially, random fluctuation in demand cannot be explained by trends, seasonality, cyclicality, or other factors like advertising and new product introduction.
( Essentially ( , ( ( ( random fluctuation ) ( in demand ) ) ( ( ( can not ) ( be ( ( explained ( by ( ( ( ( ( ( ( trends , ) seasonality ) , ) cyclicality ) , ) or ) ( other factors ) ) ) ) ( like ( advertising ( and ( new ( product introduction ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Essentially)) (, ,) (NP (NP (JJ random) (NN fluctuation)) (PP (IN in) (NP (NN demand)))) (VP (MD can) (RB not) (VP (VB be) (VP (VBN explained) (PP (IN by) (NP (NP (NNS trends)) (, ,) (NP (NN seasonality)) (, ,) (NP (NN cyclicality)) (, ,) (CC or) (NP (JJ other) (NNS factors)))) (PP (IN like) (NP (NN advertising) (CC and) (JJ new) (NN product) (NN introduction)))))) (. .)))
Trends can't always explain random variations in demand.
( Trends ( ( ( ( ca n't ) always ) ( ( explain ( random variations ) ) ( in demand ) ) ) . ) )
(ROOT (S (NP (NNS Trends)) (VP (MD ca) (RB n't) (ADVP (RB always)) (VP (VB explain) (NP (JJ random) (NNS variations)) (PP (IN in) (NP (NN demand))))) (. .)))