Apple manufacture two USB-C adapters that include a USB Type-A port.
- USB-C Digital AV Multiport Adapter
https://store.apple.com/uk/xc/product/MUF82ZM/A
This adapter usefully includes a USB-C pass-through connector to which you can simultaneously connect your iPad Power Adapter - in addition to a USB Type-A and HDMI media connection.
https://store.apple.com/uk/xc/product/MJ1M2ZM/A
This adapter is purely an USB-C to USB Type-A
Perhaps more usefully, consider one of the many third party USB-C hubs from Kingston, Anker, Hyperdrive and Satechi - although there are many others from which to choose. A Google Search for USB-C Hubs compatible with iPad will find a number of articles and recommendations.