Complex sentence: Dr. Elizabeth Alexander wound up her work in Wellington and took her children to England, leaving them with her sister as guardian while she rejoined Norman Alexander, briefly in England to buy equipment for the College, before returning to Singapore together.
Split into simpler sentences: Dr. Elizabeth Alexander wound up her work in Wellington and took her children to England, leaving them with her sister as guardian. She rejoined Norman Alexander briefly in England to buy equipment for the College, before they returned to Singapore together.