Complex sentence: Depending on the jurisdiction and circumstances, the builders of a structure may set it out themselves, or have a surveyor lay out some significant corners of it and then lay out the rest of the building themselves using a variety of techniques.
Split into simpler sentences: Depending on the jurisdiction and circumstances, the builders of a structure may set it out themselves. A surveyor often lays out the most significant corners and the the builders then lay out the rest of the building themselves using a variety of techniques.