Complex sentence: Over the subsequent decades there were several proposals to rebuild the railway along approximately the same route, however none come to fruition until 2011 when construction finally began on a renewed valley line in standard gauge from Haifa to Beit She'an which opened in 2016.
Split into simpler sentences: Over the subsequent decades there were several proposals to rebuild the railway along approximately the same route. None came to fruition however until 2011 when construction began on a renewed valley line in standard gauge from Haifa to Beit She'an which opened in 2016.