Complex sentence: The first regular passenger service began on May 10,1868, by which time entrepreneurs were building more permanent structures, and Laramie soon had stores, houses, a school, and churches.
Split into simpler sentences: The first regular passenger service began on May 10,1868, by which time entrepreneurs were building more permanent structures. Laramie City (as it was known in early years) soon had stores, houses, a school, and churches.