Complex sentence: For quite some time, the population number of European eels has been falling, so a research project has been started by Innovatie Netwerk, led by Henk Huizing, to see whether it is possible to breed European eels in captivity.
Split into simpler sentences: For quite some time, the population number of European eels has been falling. For this reason, a research project has been started by Innovatie Netwerk, led by Henk Huizing to see whether it is possible to breed European eels in captivity.