Incidents of seizing money and valuables through violence and threats are also occurring frequently.

Literal

Violence [and-や] threats [by-によって] money-and-goods [object-を] seize incidents [also-も] frequently-occurring.

暴力や脅し (violence and threats) uses や for non-exhaustive listing. ~によって marks the means. 金品を奪い去る (seize money and valuables) is a compound verb: 奪う (seize) + 去る (away). 多発している uses the formal compound 多発 + ongoing state for recurring incidents.