während

• Conj

  while

• Prep

seiner

• Pron

  his (substantival possessive)

• Det

Tätigkeit

1. activity
2. job

er

1. he.
2. it (when the grammatical gender of the object/article/thing/animal etc., being referred to, is masculine (der)).
3. she (when the grammatical gender of the noun being referred to and designating a female person, is masculine (der)).
4. Alternative spelling of Er (you (polite))

gründete

1. inflection of gründen:
2. inflection of gründen:

das

• Article

  nominative/accusative neuter singular of der: the

• Pron
• Conj

Union

• Noun

  union

• Name

in

• Prep

  1. [with dative] in, inside, within, at (inside a building)
  2. [with dative] in (pertaining to)
  3. [with dative] in, at, by (at the end of or during a period of time)
  4. [with accusative] into, to (going inside (of))

• Contraction
• Adj