Complex sentence: This unique vessel did not start as an ESV but rather as the concept of a Maintenance and Support Vessel (MSV) proposed for the Forties oil field operated by BP Petroleum Development Company Ltd in the North Sea.
Split into simpler sentences: This unique vessel did not start as an ESV, but rather as the concept of a Maintenance and Support Vessel (MSV). It was proposed for the Forties oil field, operated by BP Petroleum Development Company Ltd in the North Sea.