Complex sentence: When asked, she has repeatedly been very coy about their three-year relationship, until he reportedly left her for Portuguese TV presenter Merche Romero, which caused Nuria to enter a short depression.
Split into simpler sentences: When asked, she has repeatedly been very coy about their relationship. They dated for a while but she was dumped by Portuguese TV presenter Merche Romero, which caused Nuria to enter a short depression.