By Mike McDaniel The Nets star is expected to take part in full contact practice with his teammates next week. Nets star Ben Simmons, who has yet to play for the team since being acquired in the James Harden trade at the deadline, is expected to begin full squad practice next week, ESPN’s Adrian Wojnarowski reports. Simmons has been battling back issues since ramping up his basketball activity following his trade to the Nets. After sitting out the first half of the season following his trade request with the 76ers and while dealing with mental health concerns, Simmons was expected to appear in…