TASK DEFINITION: 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.
PROBLEM: 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 .

SOLUTION: 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 .

PROBLEM: VOR , short for VHF omnidirectional radio range , is a type of radio navigation system for aircraft , enabling them to find their position and stay on course by receiving radio signals emitted by a network of radio beacons .

SOLUTION: Very High Frequency ( VHF ) Omni-Directional Range ( VOR ) is a type of short-range radio navigation system for aircraft , enabling aircraft with a receiving unit to determine its position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons .

PROBLEM: A federation is a union of a number of self-governing states or regions , which are joined together under a central government .

SOLUTION:
A federation ( also known as a federal state ) is a political entity characterized by a union of partially self-governing provinces , states , or other regions under a central federal government ( federalism ) .