 The Wesnoth developers -- many of whom are from Europe -- used the LSM conference in France in 2004 as an opportunity to meet each other.
<fluency>  The Wesnoth developers -- many of whom are from Europe -- used the LSM conference in France in 2004 as an opportunity to meet each other.
 The Wesnoth developers -- many of whom are from Europe — used the LSM conference in France in 2004 as an opportunity to meet each other.