You mentioned the action of eating a sandwich at SUBWAY and then taking the subway home. Here is a simple expression of your sentence in English:
"After eating a sandwich at SUBWAY, I take the subway home."
This translation should capture the intended meaning while maintaining clarity and simplicity, particularly given the context that you are referring to a day in Japan. If you need further assistance, feel free to ask.
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https://staffblog.okwave.jp/2023/06/07/10415/