The following is my take:

The context has me believe that "safer of entertainment" refers to Maugham's opinion that the reader ends up getting entertainment from historians who fall short of presenting fact-based perspectives. 

I prefer to leave translation to the translator.

所有跟帖: 

Thank you very much for your explanation. -美国王过人- 给 美国王过人 发送悄悄话 美国王过人 的博客首页 (0 bytes) () 07/09/2023 postreply 20:16:27

You are always welcome. So are your translations. -renqiulan- 给 renqiulan 发送悄悄话 renqiulan 的博客首页 (0 bytes) () 07/09/2023 postreply 20:24:02

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