Complex sentence: Indium and gallium are both from boron group (group III) of elements while arsenic is a pnictogen (group V) element, thus alloys made of these chemical groups are refer to as "III-V" compounds.
Split into simpler sentences: Indium and gallium are both from boron group (group III) of elements while arsenic is a pnictogen (group V) element. Thus alloys made of these chemical groups are referred to as "III-V" compounds.