Complex sentence: The planet was discovered by the radial velocity method, using the HARPS apparatus, in June 2008; it is the most massive of the three "Super-Earth" planets in the system, and is the most distant known satellite of HD 40307.
Split into simpler sentences: The planet was discovered by the radial velocity method, using the HARPS apparatus in June 2008. It is the most massive of the three "Super-Earth" planets in the system, and is the most distant known satellite of HD 40307.