source: These regions therefore had a diverse range of different peoples and were, to some extent, unified by an Islamic culture built on both religious and civic foundations.
target: These regions had a diverse range of different peoples. The regions were unified by an Islamic culture to an extent. The culture was built on both religious and civic foundations.
references: These regions had a diverse range of different peoples. The regions were unified by an Islamic culture to an extent. The culture was built on both religious and civic foundations.