An user Spanish
says…

Los
Determiner
  pisos
Noun
  superiores
Adjective
  fueron
Auxiliary
  destruidos
Verb
  por
Adposition
  una
Determiner
  serie
Noun
  de
Adposition
  terremotos
Noun
.

The upper floors were destroyed by a series of earthquakes.
Words and sentences
New
los

New
pisos

plural of piso

New
superiores

New
fueron

  1. third-person plural preterite indicative of ir
  2. third-person plural preterite indicative of ser

New
destruidos

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
serie

New
de

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