Complex sentence: On 26 February 2014, thousands of pro-Russian and pro-Ukraine protesters clashed in front of the parliament building in Simferopol prompting Russian President Vladimir Putin to put 150,000 Russian troops on alert along the Ukrainian border.
Split into simpler sentences: On 26 February 2014, thousands of pro-Russian and pro-Ukraine protesters clashed in front of the parliament building in Simferopol. On the same day Russian President Vladimir Putin put 150,000 Russian troops on alert along the Ukrainian border.