Complex sentence: José Gaspar Flores de Abrego (1781--1836) was a Tejano most notably known for being five times mayor of San Antonio, Texas, as well as land commissioner and associate of Austin's early colonists.
Split into simpler sentences: José Gaspar Flores de Abrego (1781--1836) was a Tejano who served five terms as the mayor of San Antonio, Texas. He was also a land commissioner and associate of Austin's early colonists.