Complex sentence: The Sakhalin sturgeon is considered to be a species that migrates up the river from the sea in order to spawn.During the months of April to May, the Sakhalin sturgeon feeds in the freshwater and then returns to the ocean during the summer.
Split into simpler sentences: The Sakhalin sturgeon is considered to be a species that migrates up the river from the sea in order to spawn. JjjjjjjjjjjjDuring the months of April to May, the Sakhalin sturgeon feeds in the freshwater and then returns to the ocean during the summer.