if it were in the power of man, by informed warnings to avert disastrous events, the repeated warnings of this unique authority would have averted the tribulation which the revolution brought on the millions of mankind in the next century.

Write the above sentence using proper case.
If it were in the power of man, by informed warnings to avert disastrous events, the repeated warnings of this unique authority would have averted the tribulation which the revolution brought on the millions of mankind in the next century.