Complex sentence: While participating in New Current (Jaunā strāva) activities, she met one of its leaders, Jānis Pliekšāns (better known as Rainis), a newspaper editor, poet, and lawyer at that time.
Split into simpler sentences: While participating in New Current (Jaunā strāva) activities she met one of its leaders, Jānis Pliekšāns (better known as Rainis). He was a newspaper editor, poet, and lawyer at that time.