Complex sentence: Colchester is also the location of a major junction where the GEML links to the Sunshine Coast Line, which runs south to and, via a short branch, to; services to and from also join the GEML at the Colchester junction.
Split into simpler sentences: Colchester is also the junction where the GEML links to the Sunshine Coast Line, which runs south to and, via a short branch, to. Services to and from also join the GEML at the Colchester junction.