Complex sentence: In 1479 he was forced by Ali Kodsha to take part on the Ottoman campaign against Transylvania, where he faced his arch-rival uncle Basarab Laiotă cel Bătrân who had been living since 1477, having been ousted from the throne of Wallachia, by cel Tânăr.
Split into simpler sentences: In 1479 he was forced by Ali Kodsha to take part on the Ottoman campaign against Transylvania. In Transylvania he ought against his rival Basarab Laiotă cel Bătrân who had been living since 1477, having been ousted from the throne of Wallachia, by cel Tânăr.