An user Spanish
says…

Estaban
Auxiliary
  realizadas
Adjective
  con
Adposition
  materiales
Noun
  del
  país
Noun
  y
Coordinating conjunction
  se
Pronoun
  adaptaban
Verb
  a
Adposition
  los
Determiner
  desniveles
Noun
  del
  terreno
Noun
.

They were made with materials from the country and adapted to the unevenness of the terrain.
Words and sentences
New
estaban

third-person plural imperfect indicative of estar

New
con

  1. with
  2. on

New
adaptaban

third-person plural imperfect indicative of adaptar

New
a

New
los

New
desniveles

New
del

of the, from the (+ a masculine noun in singular).

New
materiales

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