Complex sentence: He was reported as being fully recovered from his injuries by early 2004, but it later transpired that those injuries were taking longer to heal than initially anticipated; as of mid-April 2004, Beloki had yet to begin serious competition for the season.
Split into simpler sentences: He was reported as being fully recovered from his injuries by early 2004, but it later transpired that those injuries were taking longer to heal than initially anticipated. By mid-April 2004, Beloki had yet to begin serious competition for the season.