連用中止れんようちゅうし

Verb (ます-stem) + 、 + following clauseい-adjective (stem) + く + 、 + following clause

clause linking with the ます-stem (formal/written style): ~, and ...

About this pattern

Explanation

Written-style equivalent of the て-form for joining clauses: 東京へ行き、友人に会った = I went to Tokyo and met a friend. Common in reports and formal writing.