Complex sentence: The Mexican Government had encouraged him by giving him a fixed salary, and entrusting to him the management of the Pious Fund of the Californias, but in February 1842, President Santa Anna confiscated the Fund.
Split into simpler sentences: The Mexican government had encouraged him by giving him a fixed salary and entrusted to him the management of the Pious Fund of the Californias. But, in February 1842, President Santa Anna confiscated the Fund.