Complex sentence: The Guildmasters, Bob Bledsaw & Bill Owen, had traveled to TSR in Lake Geneva WI from Decatur IL ostensibly to ask them to publish Bill's American Civil War rules.
Split into simpler sentences: The Guildmasters, Bob Bledsaw & Bill Owen, had traveled to TSR in Lake Geneva, Wisconsin from Decatur. Illinois ostensibly to ask them to publish Bill's American Civil War rules.