Reibun
。

For companies trying to sell products and services to the world market, know-how in multilingual communication is essential.

Literal

Products [and-や] services [object-を] world-market [to-に] sell-[volitional-しよう]-[try-to-とする] companies [regarding-にとっては] multiple foreign-languages [by-means-of-による] communication [attributive-の] know-how [subject-が] essential is-[formal-copula-である].

A formal business-text register sentence. Three patterns to notice: ~ようとする ('try to do X, be about to do X'), ~にとって(は) ('for X, from X's perspective'), and ~による ('by means of, via' — a formal agentive). である is the formal written copula, replacing だ/です in academic and legal writing. や is the non-exhaustive listing particle for items ('and others like it'). 必須 'indispensable.'