el

masculine singular definite article; the

se

• Pron

  1. third person (also used for usted and ustedes) reflexive direct or indirect object oneself, himself, herself, itself, yourself; each other; one another
  2. used to convey the meaning of the English passive voice in the third person and with usted and ustedes

• Verb

ha

third-person singular present indicative of haber

convertido

• Adj

  converted

• Verb

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)

la

• Article

  the

• Pron
• Noun

principal

• Adj

  1. main, most important
  2. essential

• Noun

actividad

1. activity (state of being active)
2. activity (something done as an action)