Rework the following text to be cohesive.
Advised by his top military personnel that Istana Bukit Serene was an easy target. Yamashita was confident that the British Army would not attack the palace because it belonged to the Sultan of Johor.
Although advised by his top military personnel that Istana Bukit Serene was an easy target, Yamashita was confident that the British Army would not attack the palace because it belonged to the Sultan of Johor.