When leading hiking tours, for example, guides must be vigilant that groups don’t trample native plants or disturb wild animals.

I understand the sentence semantically, but the thing is I am not able to parse the text in bold, for it does seem to be a objective clause, relative clause, etc.

  • It's a declarative content clause functioning as complement of "vigilant". – BillJ Nov 14 '20 at 13:28

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