This is a common occurrence: I convert some large tree with ud2gf, and get output like this
[2,3] critical 3 (2) ADJ root (root_cop (rootA_ (PositA critical_A)) be_cop : UDS[2,3]) 1
*[1] it 1 (2) PRON expl (root_only (rootN_ (UsePron it_Pron)) : UDS[1]) 1
[2] is 2 (1) AUX cop (be_cop : cop[2]) 1
*[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] do 5 (4) VERB csubj (root_advcl (rootV_ (OblVP_ (ComplV do_V (DetCN_a_ (DetQuant IndefArt NumSg) (AdjCN (PositA preliminary_A) (UseN assessment_N)))) (PrepNP upon_Prep (MassNP_sg (AdvCN (UseN discovery_N) (PrepNP of_Prep (DetCN_a_ (DetQuant IndefArt NumSg) (UseN (CompoundN data_N breach_N))))))))) (advclMarkUDS_ to_mark (root_advcl (rootV_ (UseV see_V)) (advclMarkUDS_ (mark_ if_Subj) (root_nsubj (rootV_ (ComplV warrant_V (DetCN_a_ (DetQuant IndefArt NumSg) (UseN notification_N)))) (nsubj_ (UsePron it_Pron)))))) : UDS[5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]) 1
*[4] to 4 (3) PART mark (to_mark : mark[4]) 1
[6,7,8] assessment 8 (7) NOUN obj (DetCN_a_ (DetQuant IndefArt NumSg) (AdjCN (PositA preliminary_A) (UseN assessment_N)) : NP[6,7,8]) 1
[6] a 6 (5) DET det (DetQuant IndefArt NumSg : Det[6]) 1
[7] preliminary 7 (6) ADJ amod (PositA preliminary_A : AP[7]) 1
[9,10,11,12,13,14] discovery 10 (9) NOUN obl (PrepNP upon_Prep (MassNP_sg (AdvCN (UseN discovery_N) (PrepNP of_Prep (DetCN_a_ (DetQuant IndefArt NumSg) (UseN (CompoundN data_N breach_N)))))) : Adv[9,10,11,12,13,14]) 1
[9] upon 9 (8) ADP case (upon_Prep : Prep[9]) 1
[11,12,13,14] breach 14 (13) NOUN nmod (PrepNP of_Prep (DetCN_a_ (DetQuant IndefArt NumSg) (UseN (CompoundN data_N breach_N))) : Adv[11,12,13,14]) 1
[11] of 11 (10) ADP case (of_Prep : Prep[11]) 1
[12] a 12 (11) DET det (DetQuant IndefArt NumSg : Det[12]) 1
[13] data 13 (12) NOUN compound (data_N : N[13]) 1
[15,16,17,18,19,20,21] see 16 (15) VERB advcl (advclMarkUDS_ to_mark (root_advcl (rootV_ (UseV see_V)) (advclMarkUDS_ (mark_ if_Subj) (root_nsubj (rootV_ (ComplV warrant_V (DetCN_a_ (DetQuant IndefArt NumSg) (UseN notification_N)))) (nsubj_ (UsePron it_Pron))))) : advcl[15,16,17,18,19,20,21]) 1
[15] to 15 (14) PART mark (to_mark : mark[15]) 1
[17,18,19,20,21] warrants 19 (18) VERB advcl (advclMarkUDS_ (mark_ if_Subj) (root_nsubj (rootV_ (ComplV warrant_V (DetCN_a_ (DetQuant IndefArt NumSg) (UseN notification_N)))) (nsubj_ (UsePron it_Pron))) : advcl[17,18,19,20,21]) 1
[17] if 17 (16) SCONJ mark (mark_ if_Subj : mark[17]) 1
[18] it 18 (17) PRON nsubj (nsubj_ (UsePron it_Pron) : nsubj[18]) 1
[20,21] notification 21 (20) NOUN obj (DetCN_a_ (DetQuant IndefArt NumSg) (UseN notification_N) : NP[20,21]) 1
[20] a 20 (19) DET det (DetQuant IndefArt NumSg : Det[20]) 1