Complex sentence: The term "single-payer" thus only describes the funding mechanism--referring to health care financed by a single public body from a single fund--and does not specify the type of delivery, or for whom doctors work.
Split into simpler sentences: The term "single-payer" thus describes only the funding mechanism, health care financed by a single public body from a single fund. It does not specify the type of delivery or for whom doctors work.