Complex sentence: However, Basu began working on Ileana's dubbing portions by end of April 2012, because D'Cruz was unfamiliar with the Hindi language and wanted to learn it whilst filming.
Split into simpler sentences: However, Basu began working on Ileana's dubbing portions by end of April 2012. This was because D'Cruz was unfamiliar with the Hindi language and wanted to learn it whilst filming.