Complex sentence: Between the 10th century to the mid 18th century, northern India has been invaded by a number of Turkic invders based in what today is Afghanistan Among them were the Ghaznavids, Ghurids, Khiljis, Suris, and Durranis.
Split into simpler sentences: Between the 10th century to the mid 18th century, northern India has been invaded by a number of Turkic invders based in what today is Afghanistan. Amongst them were the Ghaznavids, Ghurids, Khiljis, Suris, and Durranis.