Complex sentence: The offices of Microsoft Ireland which employ approximately 1,200 people are located at the estate, this is the EMEA Operations Center which was located in Ireland since 1985 and carries out a variety of activities including development and translation of Microsoft products.
Split into simpler sentences: The offices of Microsoft Ireland, which employ approximately 1,200 people, are located at the estate. This is the EMEA Operations Center which was located in Ireland since 1985 and carries out a variety of activities including development and translation of Microsoft products.