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: Mac OS X Tiger ( version 10.4 ) is the fifth major release of Apple 's Mac OS X.

SOLUTION: Mac OS X Tiger ( version 10.4 ) is the fifth major release of Mac OS X ( now named macOS ) , Apple 's desktop and server operating system for Mac computers .

PROBLEM: The effect of mountain chains on winds is to carry warm air belonging to the lower region into an upper zone , where it expands and loses heat , and drops snow or rain .

SOLUTION: The effect of mountain chains on prevailing winds is to carry warm air belonging to the lower region into an upper zone , where it expands in volume at the cost of a proportionate loss of temperature , often accompanied by precipitation in the form of snow or rain .

PROBLEM: The Civil Registry and Identification Service is an institution for public service in Chile .

SOLUTION:
The Civil Registry and Identification Service is the Chilean public service in charge of registering civil statuses of persons and other issues which , by law , it has to register .