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I suggest to format any multiline content in widgets with wpautop() to get paragraphs from two line breaks.
For example, I have to wrap wp_kses_post($team_member['details']) in wpautop (and get echo wpautop(wp_kses_post($team_member['details']))) to get long description into <p> tags. lsow-team-members-widget/tpl/default.php?rev=1463047#L53
Also, I suggest you to use WordPress filters and hooks to allow customizing of widgets instead of editing code of widgets.