Complex sentence: Catholic penetration was furthered by two small insurrections protesting the conscription of forced labour for the plantations, in 1898 and 1910, after which the Bubi were disarmed in 1917 and left dependent on the missionaries.
Split into simpler sentences: Catholic penetration was furthered by two small insurrections in 1898 and 1910 protesting the conscription of forced labour for the plantations. Afterwards the Bubi were disarmed in 1917, and left dependent on the missionaries.