Jemmy, it's important to look for certain words ("signaalwoorden") such as "dat", "die", "omdat", "want" etc.
Some examples, the "bijzin" is marked by [ and ] :
Ik spreek Nederlands, [omdat ik in Nederland geboren ben.] --> I speak Dutch [because I was born in the Netherlands.]
Ik sprak gisteren met een man, [die pas vijf jaar in Nederland woont.] --> Yesterday I spoke to a guy [who has only been living in the Netherlands for the past five years.]