( ( ( The ( tectonic relationship ) ) ( of ( ( ( ( ( ( ( ( ( the ( Sangihe Plate ) ) , ) ( Halmahera Plate ) ) , ) and ) ( the ( Molucca ( Sea Plate ) ) ) ) , ) plus ) ( ( ( the ( volcanic ( Halmahera Arc ) ) ) and ) ( the ( Sangihe Arc ) ) ) ) ) ) ( ( is complex ) . ) )
(ROOT (S (NP (NP (DT The) (JJ tectonic) (NN relationship)) (PP (IN of) (NP (NP (NP (DT the) (NNP Sangihe) (NNP Plate)) (, ,) (NP (NNP Halmahera) (NNP Plate)) (, ,) (CC and) (NP (DT the) (NNP Molucca) (NNP Sea) (NNP Plate))) (, ,) (CC plus) (NP (NP (DT the) (JJ volcanic) (NNP Halmahera) (NNP Arc)) (CC and) (NP (DT the) (NNP Sangihe) (NNP Arc)))))) (VP (VBZ is) (ADJP (JJ complex))) (. .)))
The tectonic relationship of the Sangihe Plate, Halmahera Plate, and the Molucca Sea Plate, plus the volcanic Halmahera Arc and the Sangihe Arc is complex.
(ROOT (S (NP (DT A) (JJ volcanic) (NN arc)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (VBG subducting) (NN plate)) (VP (VBZ flows) (PP (IN under) (NP (DT another) (JJ tectonic) (NN plate)))))))) (. .)))