An user Spanish
says…

Sus
Determiner
  ascensos
Noun
  posteriores
Adjective
  los
Pronoun
  obtuvo
Verb
  por
Adposition
  riguroso
Adjective
  escalafón
Noun
  jerárquico
Adjective
.

His subsequent promotions were obtained by rigorous hierarchical ranking.
Words and sentences
New
sus

New
ascensos

plural of ascenso

New
posteriores

plural of posterior

New
los

New
obtuvo

third-person singular preterite indicative of obtener

New
por

  1. by (indicates the creator of a work)
  2. for (indicates something given in an exchange)
  3. through, out, via (indicating movement)
  4. across (indicating movement)
  5. about
  6. due to, because of, for, for the sake of, out of (to express cause or motive)
  7. over
  8. times, by, multiplied by
  9. according to, for, regarding (to express opinion or something concerning someone)
  10. via, through, by (indicating the means of something)
  11. for (indicating duration)
  12. for, for the sake of, on behalf of (indicating doing something for someone's benefit)
  13. per, for each
  14. to (indicating something that has not yet passed)
  15. about to (indicating something that will soon happen)
  16. compared to; against; versus (indicating a comparison)

New
escalafón

ranking, hierarchy; an echelon

New
jerárquico

hierarchical

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