Complex sentence: She was the eldest surviving child of John Patrick West and Matilda "Tillie" Delker (sometimes spelled "Dilker"), who, with her five siblings, had emigrated with their parents, Jacob and Christiana, from the German state of Bavaria in 1886.
Split into simpler sentences: She was the eldest surviving child of John Patrick West and Matilda "Tillie" Delker (sometimes spelled "Dilker"). Delker and her five siblings emigrated with their parents, Jacob and Christiana, from the German state of Bavaria in 1886.