Akai also joined in, and the area in front of the goal became a melee.
Literal
There [to-に] Akai-player [also-も] joined, goal-front [topic-は] melee-pattern [formal become-となった].
Sports commentary language. 混戦模様 (melee pattern/appearance of a scramble) is a sports journalism compound. ~となった is the formal version of ~になった, typical of reporting. 選手 (player/athlete) is the standard suffix for athletes in news.