Complex sentence: The next year saw fertile eggs but none survived to hatching, but in April 2016 a pair of reintroduced cranes hatched two chicks, one of which survived to fledge, represented the first in the wild in Louisiana since 1939.
Split into simpler sentences: The next year saw fertile eggs but none survived to hatching. However, in April 2016 a pair of reintroduced cranes hatched two chicks, one of which survived to fledge, represented the first in the wild in Louisiana since 1939.