Complex sentence: This district was under the control of Phi Chai district, Pitsanulok precinct; afterwards, it was established as an Uttaradit province and the Bang Pho district became the capital district.
Split into simpler sentences: This district was under the control of Phi Chai district, Pitsanulok precinct. Later, it was established as Uttaradit Province and Bang Pho district became the capital district.