Complex sentence: František Čermák and Michal Mertiňák, in their first year on tour together, won 5 titles., the Abierto Mexicano Telcel, the MercedesCup, at the ATP Studena Croatia Open Umag, the BCR Open Romania, and finally at the Valencia Open 500.
Split into simpler sentences: František Čermák and Michal Mertiňák, in their first year on tour together, won 5 titles. In the Abierto Mexicano Telcel, the MercedesCup, at the ATP Studena Croatia Open Umag, the BCR Open Romania, and finally at the Valencia Open 500.