Complex sentence: Areva/Siemens estimate a new 1,600MWe European Pressurized Water Reactor to start in Olkiluoto in 2013 i.e. the construction would be 8 years (2005-2013) instead of 4 years (2005-2009).
Split into simpler sentences: Areva/Siemens estimate the new 1,600MWe European Pressurized Water Reactor in Olkiluoto will start in 2013. The construction would be 8 years (2005-2013) instead of 4 years (2005-2009).