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: In 2003 , he played Slap Jack in " 2 Fast 2 Furious " .

SOLUTION: In 2003 , he played the role of Slap Jack in the second installment of the " Fast and the Furious " film series , " 2 Fast 2 Furious " .

PROBLEM: An abelian group is a set , " A " , together with an operation " " .

SOLUTION: An abelian group is a set , " A " , together with an operation that combines any two elements " a " and " b " to form another element denoted " a " " b " .

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 .