Complex sentence: They will return again in February/March 2014 to perform 3 more shows as part of their 50 & Counting Tour so they would then have a record 28 shows at the stadium over 24 years.
Split into simpler sentences: They will return again in February/March 2014 to perform 3 more shows as part of their 50 & Counting Tour. They would then have a record 28 shows at the stadium over 24 years.