) they saw him, they were shocked. Since the act of being "shocked" is on the part of "they" and their being shocked is dependent upon when they saw him , I would actually omit the first "when", and include the one you have in parenthesis. "
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AnonymousWhen he went into the seminar room and (when?) they saw him, they were shocked.Since the act of being "shocked" is on the part of "they" and their being shocked is dependent upon when they saw him, I would actually omit the first "when", and include the one you have in parenthesis.