A sixth group that I joined consisted of women who made embroidered pictures and lived in a working-class neighborhood in Maud, in south-eastern Santiago, that was slightly too well-off to be called a shantytovm, and whose inhabitants did not think of themselves as living in a shantytown, and for these reasons I did not examine data from this group for the book.
These groups accepted me as a participant observer, in which role I watched their work and helped as much as I could without changing what they normally did. I observed them for a year, except in the case of one of the groups of women from southern Santiago, which I observed for two months. Even though I concluded the participant observa-tion five years after Pinochet stepped down, the data gained were still pertinent to this book, as they enabled me to learn about the shantytowns and shantytown family life.
Source: p 13, Surviving Dictatorship: A Work of Visual Sociology By Jacqueline Adams
Does in which + noun = a noun in which? Even if so, more generally, what are the structures and syntax behind in which + noun? in which is a relative pronoun, right? So how can a noun follow it?