Complex sentence: The building was designed by Miss Lola Shepherd, the first woman in South Africa to qualify as an Architect, and who designed the new building for her own old school (Mitchell High School, opened 10 September 1954).
Split into simpler sentences: The building was designed by Miss Lola Shepherd, the first woman in South Africa to qualify as an Architect. She designed the new building for her own old school (Mitchell High School, opened 10 September 1954).