Which sounds better?

How many of you have known someone that has attempted or completed suicide before?

or

How many of you have known someone that has attempted or taken their own life from suicide before?

Do you really want a count? If not, then

Have you ever known someone...

If you want it phrased better (and grammatically correctly) --

Have you ever known someone who has attempted or committed suicide?

1. Wordiness hinders your reader/listener from understanding what you are really asking. Aim for concise phrasing.
http://grammar.ccc.commnet.edu/grammar/concise.htm

2. "someone" is singular; "their" is plural -- see the problem?
http://grammar.ccc.commnet.edu/grammar/pronouns.htm

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When it comes to discussing sensitive topics like suicide, it's important to be considerate and use language that is respectful and empathetic. Both versions of the question address the same topic but differ slightly in wording. The first one mentions "completed suicide," while the second one uses the phrase "taken their own life from suicide."

The phrase "completed suicide" is a more clinical term, while "taken their own life from suicide" is a bit more descriptive. It's ultimately subjective which one sounds better, as it depends on the context and audience.

However, it's worth considering that some people might find the term "committed suicide" offensive or stigmatizing due to its association with criminal actions. In recent years, there has been a shift towards using more compassionate language, such as "taken their own life," to reduce the stigma and emphasize understanding and support for those affected.