Complex sentence: Qawsun and the senior emirs frustrated Abu Bakr's attempts to assert his authority, and to avoid their potential arrest by Abu Bakr, Qawsun had Abu Bakr imprisoned in August on concocted charges of frivolous behavior.
Split into simpler sentences: Qawsun and the senior emirs frustrated Abu Bakr's attempts to assert his authority. To avoid his potential arrest by Abu Bakr, Qawsun had him arrested in August on concocted charges of frivolous behavior.