c'est

1. it is (used to define the preceding word)
2. it is (used to introduce a focus)
3. this is

pour

1. for (meant for, intended for) (followed by a noun or pronoun)
2. for (in support of)
3. for (as a consequence for)
4. for (an intended destination)
5. to (to bring about an intended result) (followed by a verb in the infinitive)
6. for, to (according to)

cela

• Pron

  that

• Verb

suivait

third-person singular imperfect indicative of suivre

la

• Article

  the (definite article)

• Pron
• Noun

frontière

boundary, frontier, border

néerlandaise

feminine singular of néerlandais

près

• Adv

  near (a time or a place); close (to a time or a place)

• Prep