Complex sentence: Meanwhile, the man in the yellow suit has been pursuing the Tucks and once he discovers Winnie having been taken by them and overhears their whole conversation, he steals their horse, and rides her back to the Foster homestead.
Split into simpler sentences: Meanwhile, the man in the yellow suit has been pursuing the Tucks. Once he discovers Winnie has been taken by them and overhears their whole conversation, he steals their horse, and rides her back to the Foster homestead.