( ( The seminars ) ( ( lasted ( ( ( ( four weeks ) and ) each ) ( had ( ( approximately 30 ) participants ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS seminars)) (VP (VBD lasted) (SBAR (S (NP (NP (CD four) (NNS weeks)) (CC and) (NP (DT each))) (VP (VBD had) (NP (QP (RB approximately) (CD 30)) (NNS participants)))))) (. .)))
The seminars lasted four weeks and each had approximately 30 participants.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))