为此 is a formal connector commonly used in writing and official speech. It can appear at the beginning of a sentence (为此,我们…) or in the middle (他为此付出了很大代价).
grammar
Similar formal connectors: 因此 (yīncǐ, therefore — emphasizes cause), 为此 (wèicǐ, for this — emphasizes purpose), 对此 (duìcǐ, regarding this — introduces a response).