Mac Mini M4 USB-C to USB-A splitter recommendations

You will need a USB-C Hub that has a dedicated USB-C pass-through power connection...

There are many third-party USB Hubs that have a USB-C connection for the host computer (this often being a USB-C pigtail connection) - plus a USB-C PD (Power Delivery) pass-through power connector to which you can connect your USB-C Power Adapter - along with the hub itself incorporating a combination of additional USB-C ports, USB 2.0/3.1 Type-A ports, Ethernet LAN, HDMI, VGA, SD and microSD card-readers - and in some cases, a 3.5mm analog audio/headphone jack.

Perhaps consider Kingston, Anker, Hyperdrive and Satechi - although there are many others from which to choose. A Google Search for USB-C Hubs compatible with Mac will find a number of articles and recommendations. 

When I bought my M4 mini I had a 10 port powered hub I was using with an older computer. All I had to do was buy a converter cable to went from USB-A/B to USB-C. I use my powered hub with a keyboard, mouse, and external drive (that is also independently powered) and then maybe also a flash drive or some other brief use peripheral. There are no problems. Yes, it is USB 2 but for backup purposes I don't care if it is slower since I have my computer set to backup every 2 hours. A keyboard and mouse certainly don't need anything faster. USB 2 hubs will be a lot cheaper now that they are old tech.

it's not called a splitter it's called an usb hub

if it was me then I would take a look at

Amazon.com : usb-c hub

stankovichsr.joseph wrote:

Thank you!

You are very welcome.

Hopefully, now armed with appropriate knowledge, you will be able to identify a USB hub that meets your needs. The benefit of a USB-C powered hub, itself powered from a suitable USB-C Power Adapter, is the hub itself being able to charge the host computer and simultaneously supply power to connected USB peripherals.

Hard Disk Drives (HDD) are notoriously power-hungry.