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: Mebyon Kernow – The Party for Cornwall ( , MK ; Cornish for " Sons of Cornwall " ) is a political party in Cornwall .

SOLUTION: Mebyon Kernow – The Party for Cornwall ( -RSB- , MK ; Cornish for " Sons of Cornwall " ) is a Cornish nationalist , centre-left political party in Cornwall , a county in the southwestern United Kingdom .

PROBLEM: A doorstop ( or door stop or doorstopper ) is a tool .

SOLUTION: A doorstop ( also door stopper , door stop or door wedge ) is an object or device used to hold a door open or closed , or to prevent a door from opening too widely .

PROBLEM: The magnetic field of the Earth , and of other planets that have magnetic fields , is caused by dynamo action of molten iron in the planetary core .

SOLUTION:
The magnetic field of the Earth , and of other planets that have magnetic fields , is generated by dynamo action in which convection of molten iron in the planetary core generates electric currents which in turn give rise to magnetic fields .