Complex sentence: Among the English settlers in the present Elmhurst section of Newtown was Gershom Moore, in whose orchard a chance seedling produced the Newtown Pippin, Colonial America's most famous apple.
Split into simpler sentences: Among the English settlers in the present Elmhurst section of Newtown was Gershom Moore. A chance seedling eventually produced the Newtown Pippin, Colonial America's most famous apple.