Sentence 1: This electrification has been extended further north to Paraparaumu since 1983 and back to Waikanae in 2011 .
Sentence 2: This electrification has since been extended further north to Paraparaumu in 1983 and again to Waikanae in 2011 .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?