The use of biometric indicia for identification purposes requires that a particular biometric factor be unique for each individual, that it be readily measured, and that it be invariant over time.

Could you say simpler examples which I can use such structure within?

  • I think I got the structure, they refer to subordinate clauses of require?
    – Ahmad
    Jul 28 '15 at 14:29
  • Yes, you got it! Also, this may be useful: www-01.sil.org/linguistics/glossaryoflinguisticterms/… Jul 28 '15 at 14:37
  • Jup. That's it. Like: "Requires [subordinate clause 1], [subordinate clause 2], and [subordinate clause 3]. Why don't you write the answer yourself? I think you are ready...
    – Stephie
    Jul 28 '15 at 14:38

The word that here acts as a subordinating conjunction. It refers to the subordinate clause each time:

The use of biometric indicia for identification purposes requires...

This is your main clause (however, you could also see the entire sentence including the subordinate clauses as the main clause).

The following three sentences are your subordinate clauses, linked to require by that:

  • that a particular biometric factor be unique for each individual
  • that it be readily measured
  • that it be invariant over time.

The three subordinate clauses are linked together through coordinated conjunctions (the comma and and) on their level.

Some additional information:

Your sentence is what we call a complex-compound sentence. A sentence with a main and a dependent clause is a complex sentence. One with two or more independent clauses is a compound sentence. In this case, your sentence is a complex sentence, but because it contains two or more dependent clauses that are coordinated (thus compound), your sentence is compound complex. If you turn this around and have multiple main clauses that have subclauses (dependent clauses), you get a compound-complex sentence.

  • Well, to make it a bit harder question, can I omit all the three thats?
    – Ahmad
    Jul 28 '15 at 14:47
  • I think you can. It certainly doesn't sound wrong, but I think it's better not to omit them in order to avoid confusion.
    – Vlammuh
    Jul 28 '15 at 14:53
  • You could say: To be used for identification purposes, a particular biometric factor must be unique for each individual, readily measured, and invariant over time. Jul 28 '15 at 15:17

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