( ( ( The ( half period ) ) ( of ( the ( square wave ) ) ) ) ( ( is ( divided ( into ( ( time intervals ) ( of ( equal size ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ half) (NN period)) (PP (IN of) (NP (DT the) (JJ square) (NN wave)))) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (NP (NN time) (NNS intervals)) (PP (IN of) (NP (JJ equal) (NN size))))))) (. .)))
The half period of the square wave is divided into time intervals of equal size.
(ROOT (S (NP (NN Period)) (VP (VBZ is) (NP (NP (DT the) (NN time) (NN interval)) (VP (VBN required) (PP (IN for) (NP (CD one) (JJ complete) (NN wave) (S (VP (TO to) (VP (VB pass) (NP (NP (DT a) (NN point)) (VP (VBN called))))))))))) (. .)))