Original sentence: In traditional Living campaigns, you cannot level without gaining experience from playing in adventures.The campaign provides periodic level bumps so everyone in the campaign is the same level.WOTC began, with Legacy of the Green Regent, to offer a living style campaign that was a slightly different play experience.Your character in the campaign isn't as static, meaning you can change a lot of details in between play opportunities
Edited sentence: Characters in the campaign are not static, meaning players can change many of their character's details between adventures.In traditional Living campaigns you cannot level without gaining experience from playing in adventures.The campaign provides periodic level bumps so everyone in the campaign is the same, or nearly the same, level.Wizards of the Coast began, with Legacy of the Green Regent, to offer a living style campaign that was a slightly different play experience