Yup you can create , complex workflows as well in databricks bundles , some examples can be
You can have all of them defined from child to parent and can call those chirl workflows as workflow task in the parent workflows, all different kinds of tasks like if-else tasks, foreach task, notebook task ,dlt pipeline task , SQL task, workflow task etc can be defined. You can create separate yaml files for each of those workflows as well by following standard naming conventions or if you want you can have all of them in a single bundle.resources.yml file as well.

here are some links which can be helpful
- https://docs.databricks.com/aws/en/dev-tools/bundles/resources
- https://docs.databricks.com/aws/en/dev-tools/bundles/resource-examples
- https://docs.databricks.com/aws/en/dev-tools/bundles/job-task-types
- https://docs.databricks.com/aws/en/dev-tools/bundles/job-task-override

I guess these might be helpful.