Complex sentence: Boombox is a common term for a portable transistorized cassette tape recorder/player and AM/FM radio (and, beginning in the 1980s, a CD player) with an amplifier, two or more loudspeakers and a carrying handle.
Split into simpler sentences: Boombox is a common term for a transistorized portable music player featuring a cassette tape recorder/player and AM/FM radio. Sound is delivered through an amplifier, two or more loudspeakers and a carrying handle.