In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The earliest of these are the chambered tombs , although later came the building of stone circles , a trend that would continue into the following Bronze Age .
The earliest of these are the chambered tombs of the Early Neolithic , although in the Late Neolithic this form of monumentalization was replaced by the construction of stone circles , a trend that would continue into the following Bronze Age .

A collusion is a secret agreement between two or more people or groups , usually to create unlawful advantages over other groups .
A secret agreement between two or more parties to limit open competition by deceiving , misleading , or defrauding others of their legal rights , or to obtain an objective forbidden by law typically by defrauding or gaining an unfair market advantage is an example of collusion .

A thermosetting plastic , also known as a thermoset , is polymer material that irreversibly cures .
A thermosetting polymer , resin , or plastic , often called a thermoset , is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin .