Apple - How can you send the same text to multiple people without it being a group message?

The option you're looking for is located at Settings > Messages > Group Messaging. Turning this off will send all messages individually to their recipients.

Note: Disabling MMS Messaging will remove the Group Messaging toggle from the list.

Note: Some cellular service providers do not support Group Messaging, so if you have MMS enabled, and you still don't see Group Messaging, then it's likely that your provider does not support it. From Apple: If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, contact your carrier.