According to Marc, why did he and his first wife split up?

As an AI, I do not have access to personal information about individuals unless it has been publicly shared. I can't provide information about Marc or his first wife's relationship unless it has been mentioned in a publicly available source.

If you want to find out about the reasons behind Marc and his first wife's split, you could try searching for interviews, articles, or social media posts where Marc himself or someone close to him may have addressed the topic. People often share personal information on public platforms, and you may be able to find information through those channels. However, please remember to respect people's privacy and only use information that has been shared in a public context.