"same time as when" sounds a bit horrible to me. I would delete "when".
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park sang joonI'd like to know whether I can rephrase my example to the following."The militia was formed when demons and monsters appeared on the island, at the same time as (the militia was formed) when the Stormwall formed. "No. 'when' or 'at the same time (as)'. Not both. Take your choice between the two rephrasings shown below. 'as' is optiona