Complex sentence: Multiple studies have been performed concerning the safety of home births for both the child and the mother; as standard practices, licensing requirements, and access to emergency hospital care differs between regions it can be difficult to compare studies across national borders.
Split into simpler sentences: Multiple studies have been performed concerning the safety of home births for both the child and the mother. Standard practices, licensing requirements and access to emergency hospital care differ between regions making it difficult to compare studies across national borders.