An user Spanish
says…

En
Adposition
  otoño
Noun
  se
Pronoun
  forman
Verb
  los
Determiner
  harenes
Noun
  y
Coordinating conjunction
  se
Pronoun
  producen
Verb
  los
Determiner
  apareamientos
Noun
.

In autumn, harems are formed and matings occur.
Words and sentences
New
en

  1. in, at, on
  2. in (a time)
  3. in (a language)
  4. used after some verbs and translated by various prepositions in English
  5. in (in various expressions)

New
otoño

autumn, fall

New
se

New
forman

third-person plural present indicative of formar

New
harenes

plural of harén

New
los

New
apareamientos

plural of apareamiento

New
producen

third-person plural present indicative of producir

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