Complex sentence: Tengku Kudin's army from Pahang also refused to return to Pahang because they wanted to collect tax as payment for their service, and their refusal to leave made the situation worse for Tengku Kudin.
Split into simpler sentences: Tengku Kudin's army from Pahang also refused to return to Pahang because they wanted to collect tax as payment for their service. The refusal of the Pahang army to leave made the situation worse for Tengku Kudin.