If the shop A and the shop B are located in a commercial complex called OCEAN.
Is it possible to say "The shop A and the shop B are in the same commercial complex"?
That's possible, though we say "shop A/B" not "the shop A/B". A "commercial complex" consisting only (or primarily) of shops is normally called a "shopping centre" or (US) "shopping mall". By using the term "commercial complex" you are suggesting something different, probably more diverse.
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That's possible, though we say "shop A/B" not "the shop A/B". A "commercial complex" consisting only (or primarily) of shops is normally called a "shopping centre" or (US) "shopping mall". By using the term "commercial complex" you are suggesting something different, probably more diverse. If you don't mean to suggest this then say "shopping centre/mall".