Complex sentence: ENSCO is the largest offshore Jack-Up Oil and Gas well drilling contractor, with 50 offshore Jack-Up and 3 Semi-submersible drilling rig's servicing domestic US, international, and Scientific drilling markets.
Split into simpler sentences: ENSCO is the largest offshore Jack-Up oil and gas well drilling contractor. ENSCO has 50 offshore Jack-Up and 3 Semi-submersible drilling rig's servicing domestic US, international, and Scientific drilling markets.