Complex sentence: Large-scale projects to support willow as an energy crop are already at commercial scale in Sweden, and in other countries, others are being developed through initiatives such as the Willow Biomass Project in the US and the Energy Coppice Project in the UK.
Split into simpler sentences: Large-scale projects to support willow as an energy crop are already at commercial scale in Sweden. Programs in other countries are being developed through initiatives such as the Willow Biomass Project in the US, and the Energy Coppice Project in the UK.