Complex sentence: Countries, states, provinces, and other administrative regions are often carved up into tourism regions which, in addition to drawing the attention of potential tourists, often provide tourists who are otherwise unfamiliar with an area with a manageable number of attractive options.
Split into simpler sentences: Countries, states, provinces, and other administrative regions are often carved up into tourism regions. In addition to drawing the attention of potential tourists, these tourism regions often provide tourists who are otherwise unfamiliar with an area with a manageable number of attractive options.