Complex sentence: Ecopath with Ecosim (EwE) is a free ecosystem modelling software suite, initially started at NOAA by Jeffrey Polovina, but has since primarily been developed at the Fisheries Centre of the University of British Columbia.
Split into simpler sentences: Ecopath with Ecosim (EwE) is a free ecosystem modelling software suite. It was initially a NOAA initiative led by Jeffrey Polovina, but since primarily developed at the Fisheries Centre of the University of British Columbia.