Complex sentence: Richard, an orphaned sparrow, is adopted and raised by a group of storks however when they embark on their annual migration south for the winter Richard, a non migratory bird endeavours to embark on the long arduous journey to stay with his family.
Split into simpler sentences: Richard, an orphaned sparrow, is adopted and raised by a group of storks. But when they leave on their annual migration south for the winter, Richard, a little non-migrating bird, endeavors to embark on the long arduous journey to stay with his family.