Complex sentence: A new suffrage bill was introduced in 1910, but growing impatient, the WSPU launched a campaign of non-violent protest in 1912, intially smashing shop windows, but ultimately burning stately homes and bombing public buildings including Westminster Abbey.
Split into simpler sentences: A new suffrage bill was introduced in 1910, but growing impatient, the WSPU launched a campaign of protest in 1912 on the basis of targeting property and avoiding violence against any person. Initially this involved smashing shop windows, but ultimately escalated to burning stately homes and bombing public buildings including Westminster Abbey.