Complex sentence: Until recent decades, accounts of Tejano participation in the Texas revolution were notably absent, but historians such as Timothy M. Matovina and Jesús F. de la Teja have helped add that missing perspective to the battle's events.
Split into simpler sentences: Until recent decades, accounts of Tejano participation in the Texas revolution were notably absent. Historians such as Timothy M. Matovina and Jesús F. de la Teja have added the Tejano perspective of the battle's events.