Complex sentence: The motorway network in Ireland is currently under-going a major expansion programme, which through planned new road construction and redesignation of existing dual-carriageway sections of National Primary routes will lead to over 1200 km of motorway by 2015.
Split into simpler sentences: The motorway network in Ireland is currently under-going a major expansion programme. Planned new road construction and will possibly lead to over 1200 km of motorway by 2015.