Complex sentence: Offshore and remote area exploration is generally only undertaken by very large corporations or national governments, typical Shallow shelf oil wells (e.g. North sea) cost $10-30 Million, Deep water wells can cost up to $100 Million plus.
Split into simpler sentences: Offshore and remote area exploration is generally only undertaken by very large corporations or national governments. Typical Shallow shelf oil wells (e.g. North sea) cost $10-30 Million, while deep water wells can cost up to $100 Million plus.