Complex sentence: Relocating his court from "Jianzhou" to Liaodong provided Nurhaci access to more human and material resources; geographically it also brought him in close contact with the Mongol domains on the plains of Mongolia.
Split into simpler sentences: Relocating his court from Jianzhou to the Liaodong peninsula gave Nurhaci access to more human and material resources. Geographically it also brought him in close contact with Mongol domains on the plains of Mongolia.