I don't think a semicolon is right here. Are you proposing this? "He spent a sabbatical conducting field work on Trinidad and Tobago; and in Suriname." That s

I don't think a semicolon is right here. Are you proposing this? "He spent a sabbatical conducting field work on Trinidad and Tobago; and in Suriname." That sounds very odd indeed — I wouldn't say the sentence with a semicolon-sized gap in it and reading it with one is jarring. There's nothing wrong with the original sentence. When I read and say it I do so with the same cadence as "He spent a sabbatical conducting field work on Bermuda and in Suriname." The "and" in Trinidad and Tobago is just coincidence — it's not part of the sentence structure. If a reader doesn't know that Trinidad and Tobago is a place then perhaps the sentence's "in x and y and on z" would provoke them into finding this out.