Complex sentence: Despite initial discomfort between them, she and Irisviel develop a mutual respect for one another out of their steadfast dedication to protect Kiritsugu and Maiya extends her unquestioning loyalty to Irisviel as well.
Split into simpler sentences: Despite initial discomfort between them, she and Irisviel develop a mutual respect for one another out of their steadfast dedication to protect Kiritsugu. Maiya also extends her unquestioning loyalty to Irisviel as well.