The phrase "sparse information" means there is not a lot of data or details available on a particular topic. It indicates that there is not much information or only a small amount of information is known about something. Full definition
Most recent analyses of the environmental impact of natural gas have focused on production, with very sparse information on emissions from distribution and end use. (aer.com)
Be warned when the seller can provide only sparse information on the history of the car. (lawyer-monthly.com)
She gave me very sparse information but in those days I was new to the business side of writing. (thecreativepenn.com)