Complex sentence: On December 19, four of the members checked into an Econo Lodge motel in Farmers Branch, Texas (under assumed names), where they decided to rob an Oshman's Sporting Goods in nearby Irving, Texas.
Split into simpler sentences: On December 19, four of the members checked into an Econo Lodge motel in Farmers Branch, Texas (under assumed names). They decided to rob an Oshman's Sporting Goods in nearby Irving, Texas.