Complex sentence: During his stewardship the school took ownership of the estate and a period of growth occurred and the purpose-built Pre-Prep was constructed, as was a theatre, sports hall and in 2000 the Millennium Library and classroom complex.
Split into simpler sentences: During his stewardship the school took ownership of the estate and a period of growth occurred. The purpose-built Pre-Prep was constructed, as was a theatre, sports hall and in 2000 the Millennium Library and classroom complex.