Complex sentence: The team was born through the Tecamachalco franchise, which won the Segunda División title, and earned promotion to the Ascenso MX, but due to poor infrastructure, they were unable to participate, therefore establishing the new Oaxaca franchise.
Split into simpler sentences: The team was born through the Tecamachalco franchise, which won the Segunda División title, and earned promotion to the Ascenso MX. Due to poor infrastructure, they were unable to participate, therefore establishing the new Oaxaca franchise.