Huìyì kāishǐ qián, tā gěi dàjiā zuò le yī gè jiǎnduǎn de gàiyào jièshào.
Before the meeting started, he gave everyone a brief summary introduction.
Tips
usage
概要 is more formal than 摘要 (abstract/extract) and 总结 (conclusion/summary). 概要 typically appears at the beginning of a document to preview its contents; 总结 appears at the end to draw conclusions.