Complex sentence: On One snowy day after the family goes into the forest for a run, Ame (in his wolf form) finds the will to chase after a kingfisher, but loses his footing and falls into a stream, nearly drowning but is saved by Yuki.
Split into simpler sentences: On one snowy day after the family goes into the forest for a run, Ame (in his wolf form) finds the will to chase after a kingfisher. However, Ame loses his footing and falls into a stream, nearly drowning before being pulled out by Yuki.