"Their explanations are not very clear."
Translation:Leurs explications ne sont pas très claires.
Both are 3rd person possessive adjectives however:
Ses is the plural possessive adjective for "his/her/it" and is for a single owner
Leurs is the plural possessive adjective for "their" and is for multiple owners of multiple possessions (here "explanations").
I am confused, can someone please point me to the rule regarding when you use "leur" and "leurs"
Leurs explications ne sont pas très chinoises mais ils sont très espagnols. Bien hecho!