Complex sentence: In his second film of 2017, he played Daniel, a seemingly quiet and timid teenager in 1991, in the film "Hot Summer Nights", which premiered at the South by Southwest Film Festival, where Chalamet received positive reviews.
Split into simpler sentences: In his second film of 2017, Chalamet played Daniel--a seemingly quiet and timid teenager--in the film "Hot Summer Nights", which is set in 1991. It premiered at the South by Southwest Film Festival, where Chalamet again received positive reviews.