Complex sentence: Kabri's ancillary sites (such as Achziv and Avdon) were also built up and migration from the hinterland to Kabri--and its secondary sites--increased dramatically as a result of these projects.
Split into simpler sentences: Kabri's ancillary sites (such as Achziv and Avdon) were also built up. Migration from the hinterland to Kabri--and its secondary sites--increased dramatically as a result of these projects.