Complex sentence: The government also refused to recognise Kamwina Nsapu's appointment as chief due to his past anti-government stance; this led him to contest the central government's power and began calling for an insurrection since June 2016.
Split into simpler sentences: The government also refused to recognise Kamwina Nsapu's appointment as chief due to his past anti-government stance. This led him to contest the central government's power and he began calling for an insurrection in June 2016.