Complex sentence: From the ninth century to the 16th century, hundreds of thousands of Christians came to Santiago de Compostela on pilgrimages, expeditions made by individuals or groups to places where God had shown His power in some special ways.
Split into simpler sentences: From the ninth century to the sixteenth century, hundreds of thousands of Christians came to Santiago de Compostela on pilgrimages. Pilgrimages were expeditions made by individuals or groups to places where God had shown His power in some special ways.