Thenarrowfocusonindividualnationalmeasuresisbeingchangedtoabroaderfocus,inwhichthemostimportantmechanismwillbetheimplementationoftheEmissionsTradingDirectiveasageneralinstrument,enablingenterprisestochoosethemostcost-effectivespecificmeasures.

Please segment the words.
The narrow focus on individual national measures is being changed to a broader focus, in which the most important mechanism will be the implementation of the Emissions Trading Directive as a general instrument, enabling enterprises to choose the most cost-effective specific measures.