Complex sentence: On 20 June 1812, Stamford Raffles led a 1,200-strong British force attacked the walled royal city of Yogyakarta, the Javanese although outnumber the invader, wasn't prepared for the attack and was taken back by the event.
Split into simpler sentences: On 20 June 1812, Stamford Raffles led a 1,200-strong British force and attacked the walled royal city of Yogyakarta. The Javanese although outnumber the invader, wasn't prepared for the attack and was taken back by the event.