Complex sentence: The ability to produce those hydrocarbons locked in the tight shale formations is a product of advancing technology: horizontal, directional drilling, 3-D seismic and hydraulic fracture stimulation.
Split into simpler sentences: The ability to produce those hydrocarbons locked in the "tight" shale formations is a product of advancing technology. The technology of horizontal, directional drilling, 3-D seismic and hydraulic fracture stimulation.