Complex sentence: Connor, still under the D'Lo Brown name, Joined Total Nonstop Action Wrestling in March of 2003 during his time in NWA TNA he teamed with AJ Styles on many occasions together even challenging for the NWA World Tag Team Championships but were unsuccessful.
Split into simpler sentences: Connor, still under the D'Lo Brown name, Joined Total Nonstop Action Wrestling in March of 2003. During his time in NWA TNA he teamed with AJ Styles on many occasions together even challenging for the NWA World Tag Team Championships but were unsuccessful.