( ( ( ( ( Electrolytes ( are ( substances ( that ( ( conduct ( electricity when ) ) ( in ( a solution ) ) ) ) ) ) ) , ) and ) ( ( the CSF ) ( contains ( ( ( ( ( two ( such substances ) ) , ) sodium ) and ) potassium ) ) ) ) . )
(ROOT (S (S (NP (NNS Electrolytes)) (VP (VBP are) (NP (NP (NNS substances)) (SBAR (WHNP (WDT that)) (S (VP (VBP conduct) (NP (NP (NN electricity)) (FRAG (WHADVP (WRB when)))) (PP (IN in) (NP (DT a) (NN solution))))))))) (, ,) (CC and) (S (NP (DT the) (NNP CSF)) (VP (VBZ contains) (NP (NP (CD two) (JJ such) (NNS substances)) (, ,) (NP (NN sodium)) (CC and) (NP (NN potassium))))) (. .)))
Electrolytes are substances that conduct electricity when in a solution, and the CSF contains two such substances, sodium and potassium.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))