Complex sentence: Before the series, in the present-day storyline, she had an unlucky run in romance, and decided to briefly return to Malacca, where she learnt about her adoptive grandmother's bitter past.
Split into simpler sentences: Before the series, in the present-day storyline, she has an unlucky run in romance. She decides to briefly return to Malacca, where she learns about her adoptive grandmother's bitter past.