Complex sentence: It specifies that persons who are unable to secure the enjoyment of conditions necessary for an adequate standard of living have a care and closely relates to Article 22 of the UDHR, which explicitly enshrines the right to social security.
Split into simpler sentences: It specifies that persons who are unable to secure the enjoyment of conditions necessary for an adequate standard of living have a right to care. Article 25 is closely related to Article 22 of the UDHR, which explicitly enshrines the right to social security.