This is the 1260th most frequent French word.
auxquels
"Auxquels" means "to which" or "to whom" (masculine plural).
Here, 'auxquels' is used as a relative pronoun, substituting for 'à + lesquels' to indicate 'to which' in agreement with the masculine plural noun 'sujets'.
Les sujets auxquels il s'intéresse sont complexes.
The topics he is interested in are complex.
In this sentence, 'auxquels' replaces 'à + lesquels' to signify 'to which', agreeing with the masculine plural noun 'outils'.
Voici les outils auxquels je fais référence.
Here are the tools I am referring to.
'Auxquels' in this context acts as a relative pronoun combining 'à + lesquels', referring to 'concepts' (masculine plural) and meaning 'to which'.