I've undergone donor insemination.

Literal

Non-spouse artificial-insemination [object-を] received.

非配偶者間人工授精 is a dense medical compound: 非 (non) + 配偶者 (spouse) + 間 (between) + 人工 (artificial) + 授精 (insemination). A highly technical medical term that demonstrates Japanese's productive Sino-Japanese compounding.