Complex sentence: James'reign (1488 to 1513) coincided with the era of Portuguese exploration which established firm contact between Europe and Africa and the Treasurer of Scotland records the employment of some Africans at James' court.
Split into simpler sentences: James'reign (1488 to 1513) coincided with the era of Portuguese exploration which established firm contact between Europe and Africa. Certainly, the Treasurer of Scotland records the employment of some Africans at James' court.