Grammar for Everyone - Barbara Dykes 2007

Adverbial clause of time
Introduction
Part II The parts of speech

This clause tells you more about the time that something happens.

Finite verbs:  jumped, saw

Main clause:  My Aunt jumped

Conjunction (link): when

Subordinate clause: she saw the spider

Adverbial clause of time, modifying the verb ’jumped’ in the main clause.

Complex sentence